Answers
The heat of combustion of the reaction is -859 kJ/mol.
What is the enthalpy of combustion?When we talk about the enthalpy of combustion, we mean the heat that is required in order to burn up the compound in the presence of oxygen. Recall that the heat of reaction is gotten by the use of the formula;
Sum of the bond energies of the reactants - Sum of the bond energies of the products
As such, we have;
[(1 * 835) + (2 * 411)] - [(2 * 799) + (2* 459)]
= (835 + 822) - (1598 + 918)
=1657 - 2516
= -859 kJ/mol
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Related Questions
if you use compressed air to dispense a keg on a system where the gas comes into contact with the beer, which of the following will happen?
Answers
If we use the compressed air to dispense keg on a system where gas comes in contact with the beer, we get the ton of foam.
The keg is round metal or the wooden container that is used to store the beer. The compressed air is the form of the stored energy. This energy is used to function the machinery equipment or the process. The compressed air is used in the manufacture of some devices. The compressed air is a gas under the high pressure.
Thus, we get ton of foams if compressed air to dispense keg on a system where gas comes in contact with the beer.
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how do you know how to dispose of chemical waste? check all that apply. select one or more: listen carefully to the prelab instructions read container labels in the designated waste area look at the colors in the waste containers to see which one it matches ask your instructor for assistance
Answers
The appropriate ways to know how to dispose of chemical waste are:
What is chemical waste?
Chemical waste is any material that is discarded or intended to be discarded as a result of a chemical reaction, experiment, or process. Chemical waste can come in many forms, such as liquids, solids, gases, or sludges, and can be hazardous or non-hazardous.
Listen carefully to the prelab instructionsRead container labelsAsk your instructor for assistanceIt is important to follow proper disposal procedures for chemical waste to ensure safety and compliance with regulations. Preamble instructions, container labels and consulting with the instructor or supervisor are the best ways to know how to dispose of chemical waste.
It is also important to be aware of the color-coding system of waste containers in your lab and to match the waste with the appropriate container.
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The Dell Precision System board is shipped in Manufacturing mode and the User or Service Provider must select the manageability option upon first boot after replacement
You didn't even wrote a single word
Answers
In Dell Precision System board the system board is shipped in manufacturing mode, and upon first boot, the end user or service provider must select the manageability option, so the given statement is true.
What are the features of Dell?Dell sells PCs, servers, data storage devices, network switches, software, computer peripherals, HDTVs, cameras, printers, and electronics manufactured by other companies. The company is well-known for its supply chain management and electronic commerce.Dell Technologies is one of the world's largest technology companies, employing over 165,000 people worldwide. Michael Dell founded the company in 1984, and it now sells personal computers, network servers, data storage solutions, and software.Dell Precision Optimizer is your one-stop shop for automated performance tuning, utilization monitoring, and system updates. It automatically optimizes your workstation to run applications at the fastest possible speeds, increasing productivity.Enhances user experience by analyzing and learning from computer usage. Application launches faster and transitions more smoothly.The complete question:
"The Dell Precision System board is shipped in Manufacturing mode and the User or Service Provider must select the manageability option upon first boot after replacement. State true or false."
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Please anyone help!!
Answers
Answer:
Explanation: 2Mg+O2-----2MgO
2H2O2------2H2O+O2
please determine what the appropriate ketone or aldehyde would be to produce the following alcohol when using nabh4 followed by mild acid.
Answers
Aldehydes and ketones can be converted to their corresponding alcohols using NaBH 4. This method reduces NaBH4 in some way.
The process for a NaBH4 reduction is the same, with the exception that the second step's proton source is methanol. Secondary alcohols are produced when sodium borohydride (NaBH 4) is added to ketones (after addition of acid). Ketone reduction [NaBH 4] Explained: In organic chemistry, reduction refers to the addition of hydrogen to a molecule or the removal of electronegative atoms from the molecule, such as oxygen or halogen. Alcohols cannot be produced from carboxylic acids or esters using NaBH 4. Since it is more reactive than the starting carboxylic acid, the intermediate formed during this reaction—an aldehyde—cannot be separated.
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which of the following is a conclusion? which of the following is a conclusion? the candle needs oxygen to burn. the candle is 3.0 cm long. the mass of the candle is ten grams. the candle material melts when heated.
Answers
I've come to the conclusion that a candle needs oxygen to burn. The last paragraph of a research paper, essay, or article should have a conclusion that restates the thesis statement.
A conclusion consists of what?The last paragraph of a research paper, essay, or article should have a conclusion that restates the thesis statement. Your thesis should be restated in the conclusion paragraph, together with a summary of the major points you made in favor of it throughout the body of the essay and a statement of how you ultimately felt about it.The concluding paragraph or sentence of your thesis, as well as a summary of the main arguments you wanted to make in your thesis, make up the conclusion sample.The last paragraph of a research paper, essay, or article should have a conclusion that restates the thesis statement. Your thesis should be restated in the conclusion paragraph, which should also include a summary of the major supporting concepts you've covered in the paper.To learn more about conclusion refer to:
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Ni(OH)2 compound name
Answers
Nickel hydroxide is primarily employed in hybrid electric vehicles as the cathode active material for nickel hydride batteries. In the market for hybrid-type electric cars, the company's products hold a sizable market share.
What is the ni2+ ion?Niobium cation A nickel cation with a double positive charge is known as nickel(2+). It plays the part of a cofactor. It is a monoatomic dication, a nickel cation, a metal cation allergy, and a divalent metal cation.
Is precipitate Ni OH 2?The hexaminenickel (II) complex ion is created by dissolving the nickel (II) hydroxide precipitate. A precipitate of lavender is created. The precipitate turns from lavender to gray-blue in hue.
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The following reaction mechanism contains error. Which of the following statements correctly describes the curved arrows consistent with the reaction? - The curved arrow should start at the hydride, go to the hydrogen connected to oxygen and a second arrow should start from the O-H covalent bond and go to the oxygen - The curved arrow should start at the oxygen atom of the OH - There should be one more arrow - The curved arrow should start at the carbonyl oxygen atom
Answers
Start the curved arrow at the carbonyl oxygen atom.
Which of the subsequent claims best characterizes the curved arrows that are consistent with the reaction?This is because the carbonyl oxygen is the electron-rich species that is donating electrons to form the new bond. It is not consistent with the mechanism to start the curved arrow at the hydride, the hydrogen connected to oxygen, or the O-H covalent bond. Additionally, the statement "there should be one more arrow" is not correct, as the number of arrows in a mechanism depends on the specific reaction and the intermediate steps involved.It's always important to check the reactants and products, the intermediates and the stability of the intermediate in order to figure out the correct arrow pushing mechanism.To learn more about reaction refer:
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Calculate the mass of a solid substance in grams, which occupies a volume of 2 and the density 4 gm * L ^ - 1
Answers
The mass of a solid substance which occupies a volume of 2L and has a density of 4g/L is 8 grams.
How to calculate mass?Density refers to the measurement of the amount of mass per unit of volume.
In order to calculate density, you need to know the mass and volume of the item. The formula for density is:
density = mass/volume
According to this question, a solid substance occupies a volume of 2 litres and a density of 4g/L. The mass can be calculated as follows:
4g/L = mass/2L
mass = 8 grams
Therefore, 8 grams is the mass of the solid substance.
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Please hurry
Consider the proposition below.
The composition of ocean water has
remained constant for thousands of
years.
If the following statements are true,
which one provides the most support for
this proposition?
A Salt deposits that were formed
thousands of years ago by the
evaporation of ocean water have the
same composition as salt deposits
formed today.
B The composition of salt deposits formed
by the evaporation of ocean water is
similar everywhere in the world.
C The shells of marine animals that
lived thousands of years ago have
the same composition as the shells of
marine animals that live today.
D The types of marine animals living
in different parts of the world have
stayed the same for thousands of years.
Answers
option A- Salt deposits that were formed thousands of years ago by the evaporation of ocean water have the same composition as salt deposits formed today is the true statement.
Salt deposits would provide the most support for the proposition that the composition of ocean water has remained constant for thousands of years. This is because, if the salt deposits formed thousands of years ago by the evaporation of ocean water have the same composition as salt deposits formed today.
This would indicate that the composition of ocean water has remained unchanged over time. The other options may provide some support but not as much as option A.
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Which of the following could exhibit cis/trans isomerism? a. propene b. 1,2-dichloropropene c. 1-butene d. 2-butene.
Answers
Showcase of 2-butene's cis/trans isomerism. Cis-trans isomerism can only be seen in compounds that have a double bond and at least two distinct substituents on either side.
Are the following compounds isomers of cis and trans? Showcase of 2-butene's cis/trans isomerism. Cis-trans isomerism can only be seen in compounds that have a double bond and at least two distinct substituents on either side.Cis-trans isomerism can only be seen in compounds that have a double bond and at least two distinct substituents on either side.Showcase of 2-butene's cis/trans isomerism. Cis-trans isomerism can only be seen in compounds that have a double bond and at least two distinct substituents on either side.Showcase of 2-butene's cis/trans isomerism.Cis-trans isomerism can only be seen in compounds that have a double bond and at least two distinct substituents on either side.To learn more about cis/trans isomerism refer to:
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A student observed a rubber ball rolling from point A to point B on a ramp. Which argument BEST supports a claim that the ball transformed potential energy into motion?
Answers
It would have kept rolling if the period of observation had lasted longer best supports this claim.
Explain about kinetic energy?
Kinetic energy is the energy of motion. It is the energy an object possesses due to its motion. Kinetic energy can be calculated by multiplying the mass of an object by the square of its velocity and dividing it by two. The kinetic energy of an object is directly proportional to its mass and the square of its velocity. Kinetic energy is a scalar quantity, meaning it has magnitude but no direction. Examples of kinetic energy include a car accelerating, skydivers falling, or a ball rolling down a hill.
This argument supports the claim that the ball transformed potential energy into motion because it shows that the ball had enough energy to keep rolling even after the period of observation had ended. The potential energy that the ball had at point A was converted into kinetic energy as it rolled down the ramp and moved towards point B. This shows that the ball was able to transform potential energy into motion.
Therefore, It would have kept rolling if the period of observation had lasted longer is the correct answer.
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what color represents the bonds between the particles of nac2h3o2? make sure you notice the difference between the energy arrows and the bonds between the atoms that make up nac2h3o2.
Answers
The red colour denotes the bonds that make up the nac2h3o2 particle structure. Two or more atoms or molecules binding together chemically is known as chemical bonding.
Ions will produce a chemical compound. These chemical bonds are responsible for holding the atoms of the resultant molecule together. Bond lengths and angles serve as the constant equilibrium geometries around which molecules continuously fluctuate due to rotational and vibrational motions. Pure substances are composed of molecules with a common geometrical structure. The chemical formula and the structure of a molecule play important roles in determining its properties, especially its reactivity. A molecule is a collection of atoms with two or more bonded together by chemical bonds.
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Which of the following would be expected to behave as a nucleophile? Which of the following would be expected to behave as a nucleophile?-OH +NH_4 Cl- H-A B D Ea). A, B, and D onlyb). B onlyc). A and D onlyd). A, D, and E only
Answers
c). A and D only, A and D solely anticipated nucleophile behaviour, because. A chemical species known as a nucleophile can contribute an electron pair to the formation of a bond.
We can observe a negative charge on -SH, which indicates that it possesses an electron pair. Due to the lone pair of electrons that may be supplied to form a covalent bond on the N atom of ammonia (NH3), it is also a nucleophile.
Therefore, the only options for a response would be A and B.
We can see that C and D have positive charges on them, indicating that they lack electrons themselves and are unable to give them to other species. They cannot be categorised as nucleophiles as a result. A nucleophile is a reactant that contributes two electrons to the formation of a new covalent bond (i.e. a Lewis base).
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A 0.3205g sample of CaCO3 was dissolved in HCl and the resulting solution diluted to 250.ml in a volumetric flask. A 25 mL sample of the solution required 18.75mL of EDTA solution for titration to the Eriochrome Black T end point. What is the concentration of Ca2+ (mol/L) in the 250.0ml of CaCl2 solution? How many mole of Ca2+ are contained in a 250mL sample? How many mole of EDTA are contained in the 18.75mL used for titration? What is the concentration (mol/L) of the EDTA solution?
Answers
0.3205g sample of CaCO3 was dissolved in HCl and the resulting solution diluted to 250.ml in a volumetric flask. [tex]Ca^{2+}[/tex]=0.01281M[tex]Ca^{2+}[/tex]
What is meant by HCl ?
Put around 100 ml of water in a 1000 ml volumetric flask that has been cleaned and dried. 8.5 cc of concentrated hydrochloric acid should be added while swirling continuously.700 ml more of water should be added, mixed, and let to cool to room temperature.In the food, textile, metal, and rubber sectors, hydrogen chloride (HCl) is frequently employed as a bleaching agent to neutralize alkaline substances. When discharged into the soil, it is neutralized, and when it comes into contact with water, it hydrolyzes quickly.For every 100 mL of water, you'll need 10 mL of concentrated hydrochloric acid (HCl) to achieve the required concentration in order to create a 10% HCl solution.[tex]Ca^{2+}[/tex] =0.3205g CaCO3∗1mol / CaCO3100.0869g
CaCO3∗1mol[tex]Ca^{2+}[/tex]1mol / CaCO30.250L
[tex]Ca^{2+}[/tex]=0.01281M[tex]Ca^{2+}[/tex]
How many mole of [tex]Ca^{2} +[/tex] are contained in a 250mL sample?
[tex]n_Ca{^{2+} }[/tex] = (0.250 L) (0.01281 mol / L [tex]Ca^{2+}[/tex])
[tex]n_Ca^{2+}[/tex] = 3.203×[tex]10^{-3}[/tex]mol[tex]Ca^{2+}[/tex]
[tex]n_E_D_T_A[/tex] = 0.025L[tex]Ca^{2+}[/tex] ∗ 0.01281mol / L [tex]Ca^{2+}[/tex] ∗ 1molEDTA1/ 1mol[tex]Ca^{2+}[/tex]
[tex]Ca^{2+}[/tex]=0.01281M[tex]Ca^{2+}[/tex]
What is the concentration (mol/L) of the EDTA solution
[tex]n_E_{DTA }[/tex]= 3.203 \times.
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avogadro's law explores the relationship between volume and number of moles of an ideal gas. avogadro measured the volume of a gas when the number of moles changes. avogadro noticed that the volume of a gas in a closed container is to the number of moles of gas in the container.
Answers
Avogadro's law explores the relationship between volume and number of moles of an ideal gas.
What is Avogadro's law?
Avogadro's Law, the statement that, under the same conditions of temperature and pressure, equal volumes of different gasses contain the same number of molecules. The empirical relationship can be derived from the kinetic theory of gasses assuming a perfect (ideal) gas. This law applies approximately to real gases at sufficiently low pressures and high temperatures.To know more about avogadro's law, click the link given below:
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Identify the corresponding letter from the photo for each listed ilem found in microscale glassware kit; Erlenmeyer Ilask Choose; Support rod Futer flask Choose; Chcose; Long-necked round boltom flask Choose Conneclor far general Use Choose, Distillation head Choos;
Answers
According to the problem,A - Support Rod B - Long-Necked Round Bottom Flask, C - Connector for General Use ,D - Distillation Head ,E - Erlenmeyer Flask
What is the Distillation Head ?
The distillation head is the part of a distillation apparatus that is placed on top of the distillation flask. It is designed to capture and control the distillate that is produced during the distillation process. It typically consists of a thermometer, a condenser, and a collection vessel, such as a flask or a graduated cylinder. The thermometer measures the temperature of the vapor, while the condenser condenses the vapor into liquid. The collection vessel captures the liquid distillate, which is then ready for further processing or analysis. In addition to controlling the distillate, the distillation head also helps to regulate the heat and pressure of the distillation process.
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Carbonic acid is a buffer that contributes to pH stability in human blood. Write out this chemical equation and explain what happens if our blood increases or decreases in pH
Answers
In the case of human blood, this buffering reaction helps maintain an optimal pH range of 7.35-7.45.
What happens if our blood increases or decreases in pH?The chemical equation for the reaction of carbonic acid with water is:H2CO3 + H2O <-> H3O+ + HCO3-This reaction is reversible, meaning that it can be reversed by changing the pH of the solution.If the pH of the solution increases, the reaction will shift to the left, producing more carbonic acid and decreasing the pH.Conversely, if the pH of the solution decreases, the reaction will shift to the right, producing more hydronium ions and increasing the pH.The chemical equation for carbonic acid is H2CO3 ↔ HCO3- + H+. This equation shows that carbonic acid can act as an acid or a base, depending on the conditions.If our blood increases in pH, the equation shifts to the left, with more H2CO3 and less HCO3- and H+. This means that more acid is released, which helps to reduce the pH back to the normal, stable level.Conversely, if our blood decreases in pH, the equation shifts to the right, with more HCO3- and H+ and less H2CO3. This releases more base, which helps to increase the pH back to the normal, stable level.In either case, the carbonic acid acts as a buffer to keep the pH of the blood within a normal and healthy range. Without it, the body would be vulnerable to the effects of an overly acidic or overly basic environment.To learn more about The chemical equation for carbonic acid refer to:
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You want to determine the melting point c of a new material. You have n specimens on each of which you make a measurement of the melting point in degrees Kelvin, giving you a dataset m1,…,mn. We model this with random variables Mi=c+Ui, where Ui is the random measurement error. It is known that E[Ui]=0 and Var(Ui)=9467 for each i, and that we may consider the random variables M1,M2,… as independent. A) According to Chebyshev's inequality, how many measurements do you need to perform to be 90% sure that the average of the measurements is within 28 degrees of c? B) Continuing on from the previous question, now use the normal approximation (central limit theorem rule of thumb) to find a less conservative value for n. You can use that the 0.95 quantile of the standard normal distribution is q(0.95)≈1.645.
Answers
The number of measurements we need to perform to be 90% sure is 121, less conservative value for n is 35.
Given the melting point of new material = c
Number of specimens = n
The dataset of melting points = m1, m2, m3, .....mn
The equation for random variables = Mi = c + Ui where Ui is the random measurement error.
We know that E[Ui]=0 and Var(Ui)=9467 for each i.
The degrees of freedom (k) = 28
Let µ = E(Mi) = E(c+Ui) = c+E(Ui) = c+0 = c
Then σ^2 = Var(Mi) = Var(c+Ui) = Var(Ui) = 9467
Now Chebyshev's inequality states that P(x-µ)>=k<= σ^2/nk^2
Here probability = 0.1 and k = 28
n>=σ^2/0.1k^2 = 9467x0.1x28^2 = 121
Using the central limit theorem, we set the sample size to be.
The standard error = σ-x/√n
n = 1.645^2x 9467/28^2 = 35
Thus the value of n = 35
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A chemist mixed two substances together: a colorless liquid with a strong smell and a white solid with no smell. The substances’ repeating groups of atoms are shown above on the left. After they were mixed, the chemist analyzed the results and found two substances. One ending substance had the repeating group of atoms shown above on the right. Is the ending substance the same substance as the colorless liquid? What happened to the atoms of the starting substances when the ending substances formed? Be sure to explain your answers to both of these questions. Starting substances An ending substance Properties: colorless liquid sharp smell Properties: white solid no smell'
Answers
The material is the same as the smelly, colorless liquid. The repeating group of atoms shown above on the right and the other ending substance were both present in the substance that had an odorless colorless liquid and a strong scent and a white solid with no smell.
A mixture in chemistry is a compound made up of two or more distinct chemicals that are not chemically linked. A mixture is the physical blending of two or more substances while maintaining their distinct identities. It can take the shape of solutions, suspensions, or colloids.
Chemical components and compounds, among others, can be mechanically blended or mixed to create mixtures, but there is no chemical bonding or other type of chemical change, thus each ingredient retains its unique chemical characteristics.
Even though the constituents do not undergo any chemical changes, a mixture's physical characteristics, such as its melting point, may be different from those of the parts. Physical methods can be used to separate some mixes into their constituent parts.
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identify the copolymer. group of answer choices polystyrene polypropylene polyethylene nylon 6,6 polyvinyl chloride
Answers
Polystyrene is the copolymer. A copolymer is a polymer that results from the linking of two (or more) different types of monomers along a single polymer chain.
What is the purpose of a copolymer?Copolymerization is a process used to alter the qualities of manufactured plastics to satisfy specific requirements, such as lowering the glass transition temperature, modifying the glass transition temperature, regulating the wetting properties, or raising solubility. The process is known as rubber toughening, and it involves enhancing mechanical qualities.
A polymer composed of two or more monomer species is called a copolymer. Copolymers are numerous, widely used polymers in commerce. Nettle rubber, acrylonitrile butadiene styrene, and polyethylene-vinyl acetate (PEVA) are some examples (ABS).
A copolymer is a polymer that is created when two (or more) different types of monomers are bonded together in a single polymer chain, as opposed to a homopolymer, which uses only one monomer. Copolymers can be made in four different fundamental ways: randomly, alternately, blockly, and graftly.
Therefore the correct answer is polystyrene .
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which of the folooiwng best accounts for the pressure in the vessel remaining constant as the volume decreasese below .21l
Answers
The volume of gas increases by 25% when the volume falls below 21 with the constant temperature.
PV=nRT is the ideal gas equation.
PV is constant and equals k because the temperature is also constant.
Because there is 20% less pressure, P 2 = 0.8P and PV = V 2 V 2 = 0.8P PV, where PV = 0.8 V and V = 1.25V
Gas volume consequently increases by 25%.
The temperature of a system is constant during an isothermal process, which is a thermodynamic process. Thermal equilibrium is preserved because heat is transferred into or out of the system so slowly.
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The following data were collected at the endpoint ofa titration performed to find the molarity of an HClsolution.Volume of acid (HCl) used = 14.4 mLVolume of base (NaOH) used = 22.4 mLMolarity of standard base (NaOH) = 0.20 MWhat is the molarity of the acid solution?(a) 1.6 M(b) 0.64 M(c) 0.31 M(d) 0.13 M
Answers
According to the problem, the molarity of the acid solution is 0.64 M.The following data were collected at the endpoint ofa titration performed to find the molarity of an HClsolution.
What is the molarity ?
Molarity is a measure of the concentration of a solution, expressed as the number of moles of a solute per liter of solution. It is commonly used to measure the concentration of a dissolved substance in a solution. For example, a solution containing one mole of a solute dissolved in one liter of solution would have a molarity of one. Molarity is often expressed using the symbol M.
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Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO3(s).
The equation for the reaction is
2KClO3⟶2KCl+3O2
Calculate how many grams of O2(g) can be produced from heating 77.7 g KClO3(s).
Answers
Answer:
30.4 g of O2
Explanation:
To find the number of moles of KClO3, use the formula: moles = mass / molar mass.
Molar mass of KClO3 is = (39.1+35.5+3*16)=122.5g/mol
moles of KClO3 = 77.7g / 122.5g/mol = 0.634 mol
Therefore, the number of moles of O2 that can be produced is (3 moles O2/ 2 moles KClO3) x 0.634 moles KClO3 = 0.951 moles O2.
To find the mass of O2 produced, we use the formula: mass = moles x molar mass
molar mass of O2 = 2*16 =32 g/mol
mass of O2 = 0.951 moles * 32g/mol = 30.4 g of O2
So, from heating 77.7 g KClO3(s) 30.4 g of O2 can be produced.
assuming that the effects of the relative strengths of different types of electron repultsions given in the background information are considerably more important for bond angles of
Answers
An AB3N2 molecule has trigonal bipyramidal electron domain geometry (electron pair geometry).
This means the 2 of the electron pairs are axial (up and down).
The other 3 pairs point towards equitorial positions.
Since there are 2 non-bonding pairs of electrons, to minimize repulsion, these non-bonding pairs assume an equatorial position, and form a T-shaped molecular geometry
What is geometry?
Originally developed to model the physical world, geometry has applications in almost all sciences, as well as in art, architecture, and other activities related to graphics.Geometry also has applications in apparently unrelated areas of mathematics. For example, the methods of algebraic geometry are central to Wiles' proof of Fermat's Last Theorem, a problem that was stated in terms of elementary arithmetic and remained unsolved for several centuries.To know more about elements, click the link given below:
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What is the mass of 12 L of carbon monoxide (CO) gas at STP?
Answers
The mass of 12 L of carbon monoxide gas at STP is 32.16 g.
What is carbon monoxide?Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is highly toxic to humans and animals. It is a product of the incomplete combustion of carbon-based fuels, such as natural gas, coal, wood, and gasoline. Carbon monoxide poisoning occurs when the gas builds up in an enclosed space and is inhaled. Symptoms of carbon monoxide poisoning include headache, nausea, dizziness, and confusion.
The mass of 12 L of carbon monoxide gas at STP can be calculated using the ideal gas law. The ideal gas law states that the product of the
pressure (P),
volume (V),
and temperature (T) of a gas is equal to the mass (m) of the gas multiplied by the universal gas constant (R).
The equation for the ideal gas law is PV = nRT; where n is the number of moles of gas.
At STP, the pressure is 1 atm, the temperature is 273 K, and the universal gas constant is 8.314 J/mol·K. The molar mass of carbon monoxide (CO) is 28.01 g/mol.
Therefore, the mass of 12 L of carbon monoxide gas at STP can be calculated as follows:
m = (12 L)(1 atm)(273 K) / (8.314 J/mol·K)
m = 32.16 g
Therefore, the mass of 12 L of carbon monoxide gas at STP is 32.16 g.
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which of the following are compounds? select all that apply.? a) FeCl3
b) Mg
c) P8
d) Fe
e) N2O5
f) CH4
g) F2
h) CuO
Answers
FeCl3, CH4, [tex]F_2[/tex], and CuO are compounds. Thus option A, F, G, H are the answers.
A compound is a substance made up of two or more different elements that are chemically bonded together. The chemical formula for a compound represents the ratio of the elements present in the compound.
a) FeCl3 is a compound, which is made up of Iron and Chlorine elements chemically bonded together. The chemical formula for FeCl3 is FeCl3, representing the ratio of Iron and Chlorine in the compound.
f) CH4 is a compound, which is made up of Carbon and Hydrogen elements chemically bonded together. The chemical formula for CH4 is CH4, representing the ratio of Carbon and Hydrogen in the compound.
g) F2 is a compound, which is made up of Fluorine element chemically bonded together. The chemical formula for F2 is F2, representing the ratio of Fluorine in the compound.
h) CuO is a compound, which is made up of Copper and Oxygen elements chemically bonded together. The chemical formula for CuO is CuO, representing the ratio of Copper and Oxygen in the compound.
On the other hand, b) Mg is an element, not a compound. It represents Magnesium, which is a single element and not made up of two or more different elements. Similarly, c) P8 is not a chemical formula, so it is not a compound. It represents an unknown compound. d) Fe is an element, not a compound. It represents Iron, which is a single element. e) N2O5 is a molecule, not a compound. It represents Dinitrogen pentoxide, which is made up of Nitrogen and Oxygen elements but not chemically bonded together.
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an ancient human skull was found in the foothills of rexburg. in an attempt to determine when the person had lived, the skull was carbon dated. it was determined that the skull contained 80% of the 14c that is normally found in living tissue. approximately how old is the skull. the t1/2 for 14c is 5730 years.
Answers
Given that the skull contained 80% of the 14C that is normally found in living tissue, we can use the half-life of 14C to determine that the skull is about 11,460 years old.
The method of carbon dating is based on the fact that the radioactive isotope carbon-14 (14C) is present in all living organisms. When an organism dies, the amount of 14C in its tissue begins to decrease as it decays into nitrogen-14 (14N). By measuring the amount of 14C in a sample, scientists can determine how long ago the organism died. The half-life of 14C is 5730 years, which means that after 5730 years, half of the 14C in a sample will have decayed into 14N. After another 5730 years, half of the remaining 14C will have decayed, and so on. This is because it has taken 5730 years for the 14C to decay to half of the normal levels found in living tissue, and another 5730 years for it to decay to 80% of the normal levels. It's important to note that the carbon dating process is not always accurate and the age could be affected by different factors such as contamination, preservation of the sample, and the error of the measurement.
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Density is a physical property that relates the mass of a substance to its volume.
Calculate the density, in g/mL, of a liquid that has a mass of 0.125 g and a volume of 0.000225 L.
density:
Calculate the volume in milliliters of a 4.91-g sample of a solid with a density of 3.41 g/mL.
volume:
Calculate the mass of a 0.267-mL sample of a liquid with a density of 0.660 g/mL.
mass:
Answers
Answer:
0.177 g
Explanation:
To calculate the density of a liquid, the formula is: density = mass / volume
In this case, the mass is 0.125 g and the volume is 0.000225 L. So the density would be:
density = 0.125 g / 0.000225 L = 555.55 g/mL
To calculate the volume in milliliters of a solid with a known density, the formula is: volume = mass / density
In this case, the mass is 4.91 g and the density is 3.41 g/mL. To convert liters to milliliters, you must multiply by 1000.
volume = 4.91 g / 3.41 g/mL * 1000 mL/L = 1444.85 ml
To calculate the mass of a liquid with a known density, the formula is: mass = density x volume
In this case, the density is 0.660 g/mL and the volume is 0.267 mL.
mass = 0.660 g/mL x 0.267 mL = 0.177 g
dalton's atomic theory stated that matter consists of tiny indestructible particles called _______, which combine in definite ratios to form____.
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Dalton's atomic theory stated that matter consists of tiny indestructible particles called Atoms, which combine in definite ratio to form compound atoms.
According to Dalton's atomic theory all matter is composed of extremely small particles called atoms. Atoms of an element are identical in size, mass and other properties. The atoms of different elements differ in size, mass and other properties. Atoms cannot be subdivided, created or destroyed into other forms. Atoms of different elements are combine in certain ratio to form chemical compounds. Atoms are combined, separated or rearranged in a chemical reaction. Compound is a molecule made of atoms of different elements. All the compounds are molecules but not all molecules are compounds.
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