The molecular formula for the empirical formula (CHCl[tex])_{n}[/tex] is C2H2Cl2.
Here we have to find the molecular formula.
Form the ideal gas law we have:
PV = nRT
n = moles = weight(W) / molar mass(M)
PV = WRT/ M
Given:
W = 0.8g
R = 0.0821 atm/ K-mol
T = 373K
V = 256mL = 0.256L
P = 750 torr = 750 / 760
= 0.987 atm
Putting all the values we have:
0.987 × 0.256 = 0.8 × 0.0821 × 373 / M
M = 97 g/mol
As the empirical formula is (CHCl[tex])_{n}[/tex]
Molar mass = n ( 12.01 + 1.01 + 35.45)
So we have
97 = n( 48.47)
n = 2
So we have the molecular formula is (CHCl[tex])_{2}[/tex].
Therefore we get the molecular formula is C2H2Cl2.
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determine the molar concentration of ethanol (ch3ch2oh, 46.08 g/mol) in a wine that is 14% ethanol by mass. the density of this wine is 0.93 g/cm3.
2.83 M will be the molar concentration of ethanol (CH₃CH₂OH, 46.08 g/mol) in a wine that is 14% ethanol by mass.
Molar mass of CH₃CH₂OH = 46.08 g/mol
Percentage in wine = 14 %
Density of wine = 0.93 g/cm3
Molar concentration = ?
Calculate density of ethanol:
density of ethanol = (% of ethanol / 100) × density of wine
density of ethanol = (14 / 100) 0.93 g/ml
density of ethanol = 0.14 × 0.93 g/ml
density of ethanol = 0.1302 g/ml
Supose we have 1 ml wine so mass = 0.1302 g / ml
Now calculate the number moles of ethanol
number of moles = mass / molar mass
number of moles of CH₃CH₂OH = 0.1302 g / 46.08 g/mol
number of moles of CH₃CH₂OH = 0.00283
Calculate the molarity of ethanol
molarity = number of moles / molar mass in L
molarity of CH₃CH₂OH = 0.00283 mol / 1 ml × 1000 ml / 1L
molarity of CH₃CH₂OH = 2.83 mol/L
molarity of CH₃CH₂OH = 2.83 M
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Use the appropriate number of sig. figs. for all of the below calculations.
Determine the mass of a compound if the compound has a density of 4.56 g/ml and a volume of 12.06 ml. What is the percent error if the accepted value is 54.89 g? (use the appropriate sig. figs)
ans: 55.0 g
ans: 0.2%
The percent error if the accepted value is 54.89 g is 55.0 g
The percent error is the absolute value of the error divided by the accepted value, and multiplied by 100%
Here given data is
Volume = 12.06 ml
Density = 4.56 g/ml
Mass = ?
So for calculate mass we have formula
Density = mass/volume
Mass = volume × density
Mass = 12.06 ml×4.56 g/ml
Mass = 54.99 gram
We have to calculate percent error = ?
So the formula is
Percent error = approximate value - exact value / exact value ×100
Percent error = 55.0 g
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briefly describe the following modes of reproduction, in terms of: (a) number of parents; (b) genotypes of the offspring q8.1.1 asexual reproduction q8.1.2 sexual reproduction
The modes of reproduction are sexual and asexual reproduction. The number of parent involved in asexual reproduction is one and two in case of sexual reproduction.
Modes of reproduction:-
Sexual reproduction: It is a kind of reproduction when two male and female organisms' gamete cells unite to create a single zygote. This zygote divides its genetic material in half and gives the other half to the mother and father. There are many diverse methods of sexual reproduction in both plants and animals, however the fundamentals are the same. The freshly developed individual created through sexual reproduction is genetically and physically distinct from the parents.
Fertilization is the process through which sperm and egg (ovum) combine to form a zygote, which is how humans reproduce sexually. The critical phase of sexual reproduction is fertilization. Sexual reproduction will not be complete without fertilization.
Sexual reproduction: It is a reproductive method in which a single organism participates. The resultant child has nearly always the same number of chromosomes as the mother and is genetically similar to her. Thus, they are referred to as clones. They are also identical replicas of their parent cell. Different entities choose to reproduce asexually. Budding (e.g., Hydra), binary fission (e.g., Amoeba, bacteria), spore production (e.g., ferns), fragmentation (e.g., Planaria), and vegetative propagation are a few examples of asexual processes (e.g. Onion).
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_____ reactions occur when a more reactive metal reacts to displaces a ___ reactive metal in a compound.
What are the missing words?
Answer:
Displacement reactions occur when a more reactive metal reacts to displace a less reactive metal in a compound.
Explanation:
a student uses a solution of potassium hydroxide to titrate a solution of nitric acid. which question is the student trying to answer?(1 point)
In order to titrate a solution of nitric acid, a student uses a potassium hydroxide solution.
What occurs when potassium hydroxide is mixed with a nitric acid solution?Neutralization is a chemical process that happens when an acid is put to a base. Nitric acid, HNO3, reacting with the basic potassium hydroxide, KOH, is one example. A salt and water are produced by neutralizing HNO3 + KOH with H2O and KNO3.
What substances emerge from a neutralization reaction?The interaction of H+ ions and OH- ions produces water in a neutralization reaction, which occurs when an acid and a base react to form water and a salt.
The reaction is: CaCO3(s)+2HNO3 (aq)→Ca(NO3)2(aq)+CO2(g)+H2O(l).
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The electron configuration of an element is 1s^2 2s^2 2p^6. Describe what most likely happens when an atom of this element comes near an atom having seven valence electrons. State the name of the element too.
Please answer. If you don't know the answer, please don't answer.
When the element comes near an atom having seven valence electrons, no reaction will occur.
The name of the element is Neon.
Electron configuration of elementsThe electron configuration of elements shows how the total number of electrons present in the atoms of the elements are arranged in the orbitals around the nucleus.
In other words, the electron configuration of elements indicates the total number of electrons on its neutral atom, and hence the atomic number of elements.
In this case, the electron configuration is [tex]1s^2 2s^2 2p^6[/tex]. The total number of electrons is 10. Hence, the atomic number of the element is 10. The element with atomic number 10 is Neon (Ne).
Neon represents one of the inert elements on the periodic table. They possess octet electron configuration and as such, are not reactive ordinarily. Thus, if an atom of neon comes near an atom with seven valence electrons, no reaction will occur.
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Look at the image of the pedestrian trying to make her way across a street during a blizzard. How do you think extreme weather events like this blizzard will be different in the future? Why?
The most well-known blizzards are winter storms that create several inches of snow and occur with strong winds that cause blowing snow and whiteout conditions, however not all blizzards take place in this fashion.
What is a Ground Blizzard?In the Midwest, ground blizzards form with little to no concurrent (or new) snowfall. The Children's Blizzard of 1888, which caused an estimated 235 fatalities in the Great Plains, was one of the most infamous ground blizzards.Because it was preceded by uncommonly mild air, which made people let their guard down, this ground blizzard was exceedingly hazardous. Despite the fact that many individuals went outside without suitable winter clothing, the mild weather did not continue for very long. Since then, there have been innumerable further ground blizzards, many of which have been fatal.The usual ground blizzard happens when an Arctic cold front passes through the area, causing temperatures to drop and winds to pick up quite quickly, frequently reaching gusts of 50 to 60 mph. This strong wind will quickly pick up any snow that is on the ground and cause whiteout conditions if there are several inches of deep, recent snow. Cold temperatures that follow the Arctic front are another factor making these blizzards dangerous. A risk of frostbite or hypothermia exists for anyone stranded in their car or forced to walk outside.To Learn more About blizzards refer to :
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if atmospheric co2 concentration increases from 390 ppm to 800 ppm, what is the estimated percentage change in dry mass for corn? for velvetleaf?
Corn's dry mass would drop by around 8%, whereas velvetleaf's dry mass would rise by nearly 32%.
What occurs to transpiration as CO2 levels rise?An rise in atmospheric CO2 means that stomata, or the pores on leaves that exchange gases between the leaf and the atmosphere, do not need to open as much, which reduces transpiration, or plant water use. This indicates that there is less water loss and less transpiration at the scale of a leaf.
What occurs in plant cells as CO2 concentration rises?Understanding how plants react to e[CO2] is crucial because of these detrimental impacts when CO2 levels grow. Increased production of carbohydrates is a result of the increased photosynthesis that e[CO2] causes.
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All molecules have london forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore london forces. Which of these has only london forces?.
Of the options given, only I₂ exhibits the London dispersion force. So the correct answer to this question is A.
Define London dispersion force?London dispersion forces are a type of intermolecular force acting between atoms and molecules, usually electrically symmetric. That is, the electrons are symmetrically distributed with respect to the nucleus. They are part of the Van der Waals force. LDF is named after the German physicist Fritz London. It can be defined as a kind of temporary attractive force that occurs when an electron occupies it. It is considered to be the weakest intermolecular force.
H₂S exhibits a dipole-dipole interaction due to the large difference in electronegativities of hydrogen and sulfur. Because of this, their bond is polar. NH₃ shows hydrogen bonding between them. Since HF is a polar covalent molecule, it exhibits dipole-dipole interactions.
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Complete question is as follows:
"All molecules have London forces between them, but dipole-dipole and hydrogen bonding are so much stronger that when they are present we can ignore London forces. Only NONPOLAR molecules will SHOW LDF. Which of these has ONLY LDFs?"
A. I₂
B. HF
C. NH₃
D. H₂S
in terms of relative electronegativities, why does chlorine have a negative oxidation number in ccl4, but a positive oxidation number in hclo
choline has different ionization energies in CCl4CCl4Cl, it is more electronegative than C and has a negative oxidation number because it “picks up” an electron in a bond, and in HClOHClO, it is less electronegative than O Therefore, it has a positive oxidation number. Hence "lose". "Electrons in bonds
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suppose you have two samples that are equal in weight, 22.3 g zn and 22.3 g cr2o3 . calculate the number of moles of each substance.
The Number of Moles of Zn is 0.34108 and the number of moles of Cr2O3 is 0.14671.
What is Number of Moles?
The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is what determines how many moles there are of that substance. A mole of any substance is equal to 6.0231023, or Avogadro's number. The ratio of a substance's given mass in any kind of chemical reaction to the mass of one mole of that material is the number of moles of that substance.
Moles of Zn can be calculated by using the formula
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.
Moles of Cr2O3 can be calculated by using the formula
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.
Hence, 0.34108 and 0.14671 will be the number of moles for Zn adn Cr2O3 respectively.
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Zn has a mole count of 0.34108, while Cr2O3 has a mole count of 0.14671.
What is Number of Moles?
The number of moles of a substance is determined by the ratio of its given mass in a chemical reaction towards the mass of one mole of that substance. A mole, or 6.0231023, is equal to one mole of any substance. The number of moles of a substance is defined as the mass of one mole divided by the given mass of the substance in any type of chemical reaction.
The formula can be used to determine moles of zinc.
22.3 g of Zn x 1 mole Zn/65.4 g = 0.341 moles of Zn.
The formula can be used to determine moles of Cr2O3.
22.3 g of Cr2O3 x 1 mole Cr2O3/151.99 = 0.146 moles of Cr2O3.
Therefore, the moles of Zn and Cr2O3 will be 0.34108 and 0.14671, respectively.
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describe the two factors that determine whether a collision between molecules of a and b results in a reaction.
Two factors that determine whether a collision between molecules of a and b results in a reaction is the total kinetic energy of the reactant and the orientation of the collision
The collision energy must be greater than the activation energy for the reaction and the collision must occur in the proper orientation and the collision frequency must be greater than the frequency factor for the reaction and a collision between the reactant must occur and the tow factors that determine the possibility of reaction between molecules would be the total kinetic energy of the reactant and the orientation of the collision and the particles should collide so as the total energy would be equal to the activation energy of the reaction
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what occurs when aqueous aluminum nitrate, a l ( n o 3 ) 3 , reacts with aqueous ammonium phosphate, ( n h 4 ) 3 p o 4 ? select one: n h 4 n o 3 forms as a precipitate. no precipitate forms and no reaction occurs. ( n h 4 ) 3 p o 4 forms as a precipitate. a l ( n o 3 ) 3 forms as a precipitate. a l p o 4 forms as a precipitate.
Aluminum phosphate as a precipitate is produced on reaction of aqueous aluminum nitrate with aqueous ammonium phosphate.
There is a possibility that an insoluble solid substance could form when two aqueous solutions combine chemically. This substance is insoluble, and the reaction is what is known as a precipitation reaction.
A (aq) + B (aq) → C (aq)+ D (s)
The balanced chemical equation illustrating the reaction's byproducts is:
Al(NO₃)₃(aq) + (NH₄)₃PO₄(aq) → AlPO₄(s) + 3NH₄NO₃(aq)
Here, AlPO₄(s) is produced as a precipitate.
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Which was a requirement of the Affordable Care Act quizlet?.
No matter how ill they are or if they have any pre-existing conditions, it is a requirement of the Affordable Care Act that all Americans nor legal residents get health insurance.
The Affordable Care Act does what?For households earning below 100% - 400% of both the federal poverty threshold, the law offers customers subsidies (referred to as "premium tax credits") that reduce prices (FPL). Increase Medicaid coverage to include all adults with incomes below 138% of the federal poverty level.
The Affordable Healthcare Act covers who?Obamacare allows people to purchase health insurance regardless of their financial level. You may be eligible for a prescription tax credit or other special discounts that will lower the cost of your health insurance if your family income between 100% or 400percent of total of both the federal poverty threshold (FPL).
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by titration, it is found that 12.7 ml of 0.185 m naoh(aq) is needed to neutralize 25.0 ml of hcl(aq). calculate the concentration of the hcl solution.
The concentration of HCl is 0.093 M
What is titration?
Titration is a typical quantitative chemical analysis method used in laboratories to ascertain the concentration of an identified analyte. It is also referred to as titrimetry and volumetric analysis (a substance to be analyzed). A reagent, also known as a titrant or titrator, is created as a standard solution with a specified volume and concentration.
The concentration of the analyte is determined by the titrant's reaction with an analyte solution (also known as the titrand). Titration volume refers to the volume of titrant that interacted with the analyte.
Given,
Volume of NaOH = 12.7 ml
Concentration of NaOH( MNaOH) = 0.185 M
Volume of NaOH= 25.0 ml
HCl + NaOH → NaCl + H2
In this chemical reaction the ratio between the number of moles of HCl and NaOH is 1:1 .
moles of HCl = moles of NaOH
MHCl * Volume of HCl = MNaOH × Volume of NaOH
MHCl = (MNaOH ×volume of NaOH)/ volume of HCl
MHCl = ( 0.185 * 12.7)/ 25
MHCl = 0.093 M
Hence, the concentration of HCl is 0.093 M
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what would you predict for the rate if 2.5 ml of water were mixed with 2.5 ml of the potassium iodate solution
When cations and anions in an aqueous solution react to generate a precipitate, an insoluble ionic solid, precipitation processes take place.
The solubility principles for typical ionic solids can be used to determine whether or not such a reaction takes place. Before figuring out the condition of the products and creating a net ionic equation, one must refer to the solubility criteria because not all aqueous reactions produce precipitates. Scientists are able to identify the ions that are present in a solution because to the capacity to forecast these reactions, and industries are able to create compounds by taking components from these reactions. When specific cations and anions combine in an aqueous solution, precipitates are insoluble ionic solid products of the reaction. The variables that affect how a precipitate forms can be different.
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what is the equilibrium partial pressure of so3so3 in the mixture? express the pressure in atmospheres to three significant digits.
Vapour pressure rises with temperature and is a measurement of a substance's propensity to transform into a gaseous or vapour state.
The boiling point of a liquid is the temperature at which the pressure exerted by its surroundings equals the vapour pressure present at the liquid's surface. Compound molecules that bond well with one another will have a low vapour pressure (less inclination to escape to the vapour phase), whereas compounds that connect poorly with one another would have a high vapour pressure. Vapour pressure is a measure of a compound's capacity to bond with itself. Based on the strength of its intermolecular forces, a liquid's vapor pressure is one of its characteristics.
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The measurement of a substance's propensity to change into a gaseous or vapour state, vapour pressure increases with temperature.
The temperature at which the ambient pressure equals the vapour pressure existing at the liquid's surface is known as the boiling point of a liquid. Low vapour pressure indicates that a compound's molecules are well-bonded to one another and are less likely to escape into the vapour phase than high vapour pressure indicates weak bonds. An indicator of a compound's ability to bind to itself is its vapour pressure. A liquid's vapor pressure is one of its properties and depends on the strength of its intermolecular forces.
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two different compounds have the formula xef2cl2. write lewis structures for these two compounds and describe how measurements of dipole moments might be used to distinguish between them
Both the XeCl bond dipoles and the XeF bond dipoles (red) cancel.
The trans isomer is nonpolar because there is no net dipole.
The Xe-F and Xe-Cl bond dipoles do not cancel in the cis isomer.
The molecule in the cis isomer is polar and has a net dipole moment.
Let's Draw the Lewis structure.There are 32 valence electrons in the trial structure.
8+14+14=36 valence electrons for 1 Xe+2 F+2 Cl.
We add two line pairs to the center atom since we have four more electrons.
The Lewis structure is
This system is an [tex]AX_{4} E_{2}[/tex]
It has an octahedral electron geometry.
The F and Cl atoms will occupy the equatorial positions, while the bulky lone pairs will occupy the top and bottom axial positions.
Square-planar molecular geometry is present.
There are two possible arrangements for the atoms.
The binding angles between F, Xe, and Cl are 180 degrees in the trans isomer.
Both the XeCl bond dipoles and the XeF bond dipoles (red) cancel.
The trans isomer is nonpolar because there is no net dipole.
The Xe-F and Xe-Cl bond dipoles do not cancel in the cis isomer.
The molecule in the cis isomer is polar and has a net dipole moment.
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Why do nadh and fadh2 donate electrons to different electron transport chain complexes?.
This difference occurs because they charge electrons at different points in the electron transport chain.
NADH pairs electrons with the first enzyme complex, the NADH dehydrogenase complex, and FADH₂ shares electrons with the second enzyme complex, the succinate dehydrogenase complex. This modifies the number of protons pumped out of the mitochondria per molecule of NADH and FADH₂ and determines the amount of ATP produced.
NADH is the reduced form of nicotinamide adenine dinucleotide (NAD), while FADH₂ is the reduced form of flavin adenine dinucleotide (FAD). NADH is a coenzyme derived from vitamin B3 (niacin) and FADH₂ is a coenzyme derived from vitamin B2 (riboflavin)
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rubidium-87 is radioactive, decaying by the emission of a single beta particle. write the nuclear equation for this decay.
The nuclear equation for decay of rubdium-87 by the emission of single beta particle is [tex]^{87}Rb_{37}[/tex] >>> [tex]^{87}Sr_{38}[/tex] + [tex]^{0}e_{-1}[/tex]
There are 36 isotopes of rubidium (37Rb), but only two of them are present in naturally occurring rubidium: 85Rb (72.2%), and the radioactive 87Rb (27.8%). Rubidium is radioactive enough in normal rubidium mixes to fog film in around 30 to 60 days.
The half-life of 87Rb is 4.92 1010 years. It is fairly common because it easily replaces potassium in minerals. Numerous rock samples have been dated using 87Rb, which decays to stable strontium-87 by the emission of a beta particle. Sr tends to concentrate in plagioclase during fractional crystallization, leaving Rb in the liquid phase.
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The electronegativity difference between the atoms in a molecule of hcl can be used to determine.
The electronegativity difference between the atoms in a molecule of HCl can be used to determine by the polarity of the bond present between the atoms.
The electronegativity is defined as the tendency of the atom to attract the shred paired of electrons towards it self. in the case of HCl , bond the electronegativity difference is given as :
electronegativity of H = 2.20
electronegativity of Cl = 3.16
the difference in electronegativity , ΔE = 3.16 - 2.20
= 0.96
0 < ΔE < 0.5 = covalent bond
0.5 < ΔE < 2.1 = polar covalent
2.1 < ΔE = ionic bond
so, in HCl the electronegativity difference is 0.9 that means HCl is the polar covalent bond.
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what is the melting point of a solution prepared from the given quantity of solute in 1.00 kg of water?
The melting point of solution will be
a. 2.0 mol of CaCl2: -11.2
b. 20.0 g of NaCl: -1.3
What is melting point?The melting point of a liquid is the temperature at which, under atmospheric pressure, a solid transforms into a liquid. At this time, both the liquid and solid phases are in equilibrium. Additionally dependent on pressure, the substance's melting point is provided at standard pressure. The freezing point or Crystallisation point is the temperature at which a liquid reverses its state and becomes a solid. The freezing point might easily appear to be lower than it actually is due to the capacity of substances to supercool. In truth, when determining a substance's "characteristic freezing point," because the transition from solid to liquid only entails a minor change in volume, the melting point is sensitive to extremely large changes in pressure, but normally this sensitivity is orders of magnitude less than that for the boiling point.
When a solute is added in a solvent the boiling of solvent is elevated. This elevation in boiling point (ΔTb) is given by the formula ΔT=Kbm Where Kb= Boiling point constant. The melting point of a solution prepared from the given quantity of solute in 1.00 kg of water will be;
a. 2.0 mol of CaCl2: -11.2
b. 20.0 g of NaCl: -1.3
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What does the balanced reaction of titration of diprotic acid with naoh tell you about the amounts of acid and base required for the reaction?.
The amount of NaOH required is twice that of H₂SO₄. According to the balanced equation.
Define diprotic acid.Diprotic Acid(also called dibasic acid) an acid that can donate two hydrogen ions (H+) or protons per molecule in aqueous solution. A dibasic acid is a type of polybasic acid that can donate multiple protons per molecule. Examples: sulfuric acid (H₂SO₄) and carbonic acid (H₂CO₃). The number of equivalence points in the titration curve of polybasic acids depends on the number of acidic protons in the acid. Therefore, the titration curve has two equivalence points because we titrated diprotic acid with two acidic protons.
According to the balanced chemical formula:
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
The mole ratio of H₂SO₄ and NaOH is 1:2. This means that 2 moles of NaOH are required for each mole of H₂SO₄.
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Acids react with insoluble metal oxides to produce salts. Plan a method to produce a pure, dry sample of the soluble salt copper chloride from an acid and a metal oxide.
We can react copper oxide with HCL to make soluble salt of copper chloride.
CuO + 2HCl = CuCl2 +H2O
Metal oxides are usually basic in nature. When they react with acid, products are salt and water. Copper oxide is a weak base. In a neutralization reaction, acid reacts with base to form salt and water. Hydrochloric acid is a strong acid.
Copper does not react with hydrochloric acid. As a metal acid reaction leads to redox reaction. Copper has a higher reduction potential than hydrogen, so it does not react with mineral acids like hydrochloric acid or sulphuric acid.
When acid and base react to form salt and water the reaction is neutralisation reaction. Neutralization is an acid base type reaction which is non redox in nature.
Hence Copper oxide with HCl is a Neutralization reaction.
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Compute Reaction Rates for All Seven Trials
Assume that each tablet's mass was 1,000 mg, and remember that you used 0.200 L of water each time.
Compute the reaction rate to the nearest whole number using the formula below.
Reaction Rate
mass of tablet / volume of water
reaction time
3°C
Reaction time = 138.5 sec
Reaction rate =
mg/L/sec
24°C
Reaction time = 34.2 sec
Reaction rate
mg/L/sec
40°C
Reaction time = 26.3 sec
Reaction rate =
mg/L/sec
65°C
Reaction time = 14.2 sec
Reaction rate
mg/L/sec
DONE
Reaction rate at
3 °C is 36.1 mg/L/sec24 °C is 146.2 mg/L/sec40° C is 190.1 mg/L/sec65 °C is 352.1 mg/L/secWhat is reaction rate?
The rate of a chemical reaction is defined as rate of change in concentration of a reactant or product divided by its coefficient from the balanced equation
Reaction rate = [tex]\frac{mass of tablet / volume of water }{reaction time}[/tex]
For 3° C:
Reaction rate = [tex]\frac{1000mg / 0.200L}{138.5 sec}[/tex] = 36.1 mg/L/sec
For 24 °C:
Reaction rate = [tex]\frac{1000/0.200}{34.2}[/tex] = 146.2 mg/L/sec
For 40°C:
Reaction rate = [tex]\frac{1000/0.200}{26.3}[/tex] = 190.1 mg/L/sec
For 65 °C:
Reaction rate = [tex]\frac{1000/0.200}{14.2}[/tex] = 352.1 mg/L/sec
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What’s the total amount of atoms?
Answer:
45
Explanation:
Twelve plus Twenty two plus eleven equals forty five. Basically just add all the numbers to find the total number of atoms
(I could be wrong I guessed
outline the steps needed to determine the limiting reactant when 30.0 g of propane, c3h8, is burned with 75.0 g of oxygen. determine the limiting reactant.
In the reaction of 30.0 g of propane and 75.0 g of oxygen, oxygen is the limiting reagent.
The chemical equation of the reaction of propane and oxygen is as follows,
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Here, 30 grams of propane reacts with 75 grams.
Step 1- First find the moles of oxygen and propane.
Moles of propane = mass/molar mass
Moles of propane = 44/30
Moles of propane = 1.21 moles.
Now, moles of oxygen = 75/18
Moles of oxygen = 4.16 moles.
Step2- compare the moles,
Now, we see, as per the reaction, for every one mole of propane. there should be 5 moles of oxygen, hence,
1 mole propane = 5 moles oxygen
1.21 moles propane = 6.05 moles of oxygen.
So, 6.05 moles of oxygen are required but we have only 4.16 moles, so, here, oxygen is the limiting reagent.
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Be sure to answer all parts. How many electrons in an atom can have each of the following quantum number or sublevel designations? (a) n = 2, l = 1, ml = 0 (b) 5p (c) n = 4, l = 3.
(a) The maximum number of electrons an atom can have with the sublevel designation is 2 electrons.
(b) The maximum number of electrons for p-orbital is 6 electrons.
(c) The maximum number of electrons for f-orbital is 14 electrons.
(a) For n = 2, I = 1, ml = 0,
The energy level will be:
Energy level = 2(1) + 1 = 3 sub-orbitals
= -1 0 1 : ( 2 electrons each)
Thus, the maximum number of electrons an atom can have with the sublevel designation is 2 electrons.
(b) 5p
p-orbital has 3 sub-orbitals and a maximum of 6 electrons
(c) n= 4, I = 3
energy level = 2(3) + 1 = 7 sub-orbitals
7 sub-orbitals correspond to the f-orbital and it has a maximum of 14 electrons.
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Question 10 (1 point)
An lon has 20 protons and 18 electrons. What is it's charge?
a) +2
b) 20
c) 18
d) 2
e) 0
There are 20 protons and 18 electrons in a calcium ion. Each electron has a charge of -1 while each proton has a charge of +1. It has a 2 charge.
The finished text is: 20 protons and 18 electrons make up the ion Ca2+. Having 20 protons and 20 electrons, an atom of calcium. Two electrons were lost, as shown by the 2+ charge adjacent to the symbol: 20-2=18.
What ion has a 2+ charge and 18 electrons?An ion with 18 electrons and a positive charge is created by a certain element. Keep in mind that atoms have the same amount of protons and electrons as their atomic number, which is equal to the number of protons it contains. Since calcium has an atomic number of 20, it is the element in question.
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Assuming that there is adequate o2 and h2o , what mass of hno3 , in kg , can form from this amount of no2 pollutant?.
The mass of HNO₃ is 19.17kg.
How do chemical equations work?Chemical equations are symbolic depictions of chemical reactions where the reactants and products are stated in terms of their respective chemical formulae.
The equation of the reaction is;
4NO₂(g) + O₂(g) + 2H₂O(l) → 4HNO₃(aq)
There is a plenty of water and oxygen. Because it controls the amount of product formed, NO2 is referred to as a limiting reagent. With the aid of the following formula, the moles of NO2 are determined:
Mass of NO₂ produced = 14 kg
Molar mass of NO₂ = 46 g/mol
Number of moles of NO₂ = 14 × 10³ g/46 g/mol
Number of moles of NO₂ = 304.34 moles.
Utilizing stoichiometry,
HNO₃ will be produced from 4 moles of NO₂
This indicates that 304.34 moles will produce,
4/4×304.4 = 304.4.
The first equation can be used to get the mass of HNO₃ and we will obtain,
Molar mass of HNO₃ = 63gm/mol
Molar mass of HNO₃ = 63×304.34
Molar mass of HNO₃ = 19173.42 (or) 19.17.
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Complete question is "Another component of acid rain is nitric acid, which forms when NO2, also a pollutant, reacts with oxygen and water according to the simplified equation 4NO2(g)+O2(g)+2H2O(l) → 4HNO3(aq) The generation of the electricity used in a medium-sized home produces about 14 kg of NO2 per year. Part A Assuming that there is adequate O2 and H2O, what mass of HNO3, in kg, can form from this amount of NO2 pollutant?".
