Answer:
0.101 M
0.1 mol/kg
0.644
Explanation:
To calculate the molarity, molality, and mole fraction of Na2SO4 in a solution, you need to know the moles of Na2SO4 in the solution and the volume or mass of the solution.
A) Molarity: Molarity (M) is defined as the number of moles of solute per liter of solution. To calculate molarity, we need to divide the number of moles of Na2SO4 by the volume of the solution in liters.
First, calculate the number of moles of Na2SO4:
mass of Na2SO4 = 755 g
molecular weight of Na2SO4 = 142 g/mol
number of moles = mass/molecular weight = 755 g / 142 g/mol = 5.34 moles
Next, calculate the volume of the solution:
mass of water = 53,100 g
density of water = 1 g/mL
volume of water = mass/density = 53,100 g / 1 g/mL = 53,100 mL = 53.1 L
Finally, calculate the molarity:
molarity = number of moles / volume of solution = 5.34 moles / 53.1 L = 0.101 M
B) Molality: Molality (m) is defined as the number of moles of solute per kilogram of solvent. To calculate molality, we need to divide the number of moles of Na2SO4 by the mass of the solvent in kilograms.
mass of water = 53,100 g
mass of solvent in kilograms = mass in grams / 1000 g/kg = 53,100 g / 1000 g/kg = 53.1 kg
Finally, calculate the molality:
molality = number of moles / mass of solvent = 5.34 moles / 53.1 kg = 0.1 mol/kg
C) Mole fraction: The mole fraction (X) is defined as the ratio of the number of moles of solute to the total number of moles of solute and solvent in a solution. To calculate the mole fraction of Na2SO4, we need to divide the number of moles of Na2SO4 by the total number of moles of Na2SO4 and water.
number of moles of Na2SO4 = 5.34 moles
number of moles of water = 53.1 kg * 1000 g/kg / 18.015 g/mol = 2.96 moles
total number of moles = number of moles of Na2SO4 + number of moles of water = 5.34 moles + 2.96 moles = 8.30 moles
Finally, calculate the mole fraction:
mole fraction of Na2SO4 = number of moles of Na2SO4 / total number of moles = 5.34 moles / 8.30 moles = 0.644
The molarity of Na2SO4 in the solution is 0.101 M, the molality is 0.1 mol/kg, and the mole fraction of Na2SO4 is 0.644.
Metallic bond and intermolecular force
Why the density of a gold coin and a gold statue are same, even though the gold statue consists of the greater quantity of gold
Answer:
Explanation: Density is an intensive property of matter. This means that the value of density is independent of the quantity of matter present. It is measured by mass per unit volume. So, even though a gold statue may contain more mass or a larger quantity of gold than a gold coin, the density of both objects will remain the same, as they will have the same mass per unit volume.
A supersaturated solution can be prepared by dissolving solute in solvent while adding____. A supersaturated more servent solution contains more _____than can ordinarily be dissolved in the solvent detergent at room temperarte. A solution may remain supersaturated until_____is initiated, often by adding solid to the solution or by allowing solvent to evaporate.
By dissolving the solute in the solvent while adding heat, a supersaturated solution can be created. At room temperature, a supersaturated solution contains more solute.
than can normally be dissolved in the solvent. This is accomplished by dissolving the solute in a hot solvent and then progressively chilling the solution to allow the excess solute to stay dissolved, resulting in a supersaturated solution. A solution can stay supersaturated until a seed crystal is begun, which is usually accomplished by adding solid to the solution or allowing the solvent to evaporate. The seed crystal acts as a surface for surplus solute to crystallize and exit solution. The surplus solute quickly crystallizes out of solution once a seed crystal is introduced, resulting in a saturated solution.
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how many moles of o2 are needed to react fully with 4 mol of octane
Answer:
50 moles of oxygen
Explanation:
The reaction between octane (C8H18) and oxygen (O2) can be represented by the following equation:
C8H18 + 12.5O2 -> 8CO2 + 9H2O
So, to react fully with 4 mol of octane, we need 4 mol * 12.5 mol O2/1 mol C8H18 = 50 moles of oxygen.
ALLEN
Practice Problem 13.27b Predict the products that are expected when the following compound is heated with concentrated HBr. Modify the given drawing of the starting material to draw only the organic products. O- CH3 Edit
The given starting material is not visible, but if it has an -OH functional group attached to a methyl group (-OCH3), then the reaction with concentrated HBr will lead to the following products:
The -OH group will be replaced by a Br atom, forming methyl bromide (CH3Br).
Water (H2O) will also be produced as a byproduct of the reaction.
So, the organic products of the reaction are:
O-CH3 + HBr → CH3Br + H2O
In organic chemistry, a methyl group is an alkyl produced from methane that has the chemical formula CH3, one carbon atom bound to three hydrogen atoms. The group's name is frequently shortened to Me in formulas. In numerous organic molecules, this hydrocarbon group can be found. In most compounds, the group is extremely stable.
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Methanol can be produced through the reaction of CO and H2 in the presence of a catalyst.
CO(g) + 2H2(g) catalyst, CH;OH(0)
If 85 g of CO reacts to produce 61.8 g of
CH;OH, what is the percent yield of CH OH?
Answer in units of%.
Answer:
63.6%
Explanation:
To calculate the percent yield of CH3OH, we need to compare the actual yield to the theoretical yield, which is the maximum amount of CH3OH that can be produced based on the amount of CO and H2 that was used in the reaction.
The theoretical yield can be calculated using the balanced chemical equation for the reaction:
CO(g) + 2H2(g) -> CH3OH(l)
Since 1 mole of CO reacts with 2 moles of H2 to produce 1 mole of CH3OH, the moles of CH3OH produced can be calculated by dividing the mass of CO by its molar mass and then multiplying by the ratio of CH3OH to CO in the balanced equation (1 mole of CH3OH per 1 mole of CO).
Let's assume the moles of CO used in the reaction is n. Then,
n = 85 g CO / 28.01 g/mol = 3.03 moles
And the theoretical yield of CH3OH would be:
3.03 moles CO * (1 mole CH3OH/1 mole CO) = 3.03 moles CH3OH
The moles of CH3OH can then be converted to grams:
3.03 moles CH3OH * 32.04 g/mol = 97.36 g CH3OH
Finally, the percent yield can be calculated by dividing the actual yield of CH3OH (61.8 g) by the theoretical yield (97.36 g) and multiplying by 100%.
Percent yield = (Actual yield / Theoretical yield) * 100%
= (61.8 g CH3OH / 97.36 g CH3OH) * 100%
= 63.6%
So the percent yield of CH3OH is 63.6%.
tell me if you confus
ALLEN
Table C: Known Specific Heat Values for Common Materials
Material
Specific Heat
(J/g C)
4.18
Water
Concrete
Wood
Aluminum
Glass
Sand
Steel
Iron
Copper
Lead
Gold
0.88
1.80
0.90
0.84
0.83
0.49
0.44
0.38
0.16
0.13
% Error
(deviation from known)
Water is the best insulator because it has the greatest specific heat capacity and all other substances have low specific heat than the water.
What do you mean by the specific heat capacity?The term specific heat capacity is defined as the amount of heat in joules required to increase the temperature of one gram of a substance by one degree Celsius.
An insulator is a substance which conducts heat to a very miserable extent.
From the definition of specific heat capacity and insulator, we conclude that the higher the value of specific heat capacity, the harder it would be to heat up the material, that is, the more heat would be needed.
All the given substances, only water has the greatest specific heat capacity, therefore, it's the best insulator.
Gold is the best conductor, as it has the lowest specific heat capacity.
Thus, the best insulator is water.
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Your question is incomplete, most probably your question was
Table C: Known Specific Heat Values for Common
Materials
Material Specific Heat (J/g*C)
Water 4.18
Concrete 0.88
Wood 1.80
Aluminum 0.90
Glass 0.84
Sand 0.83
Steel 0.49
Iron 0.44
Copper 0.38
Lead 0.16
Gold 0.13
What is the best insulator and why?
Tutored Practice Problem 4.5.1COUNTS TOWARDS GRADE
Calculate solution concentration in molarity units.
A student weighs out 5.96 g of Zn(CH3COO)2, transfers it to a 250. mL volumetric flask, adds enough water to dissolve the solid and then adds water to the 250 mL mark on the neck of the flask.
Calculate the concentration (in molarity units) of zinc acetate in the resulting solution?
M=?
The number of moles of 5.96 g of zinc acetate is 00324 . The volume of the solution is 0.25 L. Then the molarity of the solution is 0.16 M.
What is molarity ?Molarity of a solution is a common term used to express the concentration of a solution. It is the the ratio of number of moles of the solute to the volume of solution in liters.
Given that the solution contains 5.965 g of ammonia.
molar mass of zinc acetate = 183.4 g/mol.
no.of moles in 75 g = 75/17 = 4.411 moles.
volume of solution = 250 ml = 0.25 L.
molarity = no.of moles of solute/volume of solution in L.
= 0.032 mole/ 0.25 L= 0.16 M.
Therefore, the molarity of the solution is 0.16 M.
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Build the molecular models of the compounds listed below and draw the Fischer projection for each of them. In the Fischer projection when the compound has more than one stereogenic center the longest carbon chain is drawn from top to bottom (vertical), with the functional group carbon at the top (top). Identify the pairs of molecules that represent enantiomers and diastereomers and identify each stereogenic center by writing R or S next to it.
The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.
Enantiomers are pairs of molecules that are non-superimposable mirror images of each other. Enantiomers have the same chemical and physical properties, except for their interaction with polarized light. Enantiomers have opposite configurations at every stereogenic center, so they have opposite R or S designations.
Diastereomers, on the other hand, are stereoisomers that are not mirror images of each other. Diastereomers have different physical and chemical properties, and they have different configurations at one or more stereogenic centers. Unlike enantiomers, diastereomers do not have opposite R or S designations.
To identify stereogenic centers in a molecule, one needs to determine the number of different substituents attached to a carbon atom. The R or S designation is assigned to each stereogenic center based on the priority of the substituents attached to that carbon atom.
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4. A mass of 2.50 grams of blue, hydrated copper II sulfate is placed in a container and heated to remove all of the water. After heating 1.59 grams of white, anhydrous copper II sulfate remains. What is the formula and name of the original hydrate?
The formula of the original hydrate is CuSO4 · 5H2O, and its name is copper (II) sulfate pentahydrate.
How to find the formula and name of the original hydrateFirst we need to use the mass information provided in the problem and the molar masses of the relevant compounds.
First, we can calculate the mass of water that was present in the original hydrate:
Mass of water = Mass of hydrate - Mass of anhydrous salt
Mass of water = 2.50 g - 1.59 g
Mass of water = 0.91 g
Next, we can calculate the number of moles of anhydrous copper (II) sulfate that remained after heating:
Number of moles of anhydrous salt = Mass of anhydrous salt / Molar mass of anhydrous salt
Molar mass of anhydrous copper (II) sulfate = (1 x 63.55 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) = 159.61 g/mol
Number of moles of anhydrous salt = 1.59 g / 159.61 g/mol
Number of moles of anhydrous salt = 0.00997 mol
We can then calculate the number of moles of copper (II) sulfate that were present in the original hydrate:
Number of moles of copper (II) sulfate = Number of moles of anhydrous salt
Number of moles of copper (II) sulfate = 0.00997 mol
Finally, we can use the mass of copper (II) sulfate and the number of moles of copper (II) sulfate to determine the formula and name of the original hydrate. The formula of the hydrate will be in the form of CuSO4 · xH2O, where x is the number of water molecules per formula unit.
The molar mass of CuSO4 is (1 x 63.55 g/mol) + (1 x 32.06 g/mol) + (4 x 16.00 g/mol) = 159.61 g/mol.
The mass of CuSO4 in the original hydrate is 2.50 g - 0.91 g = 1.59 g.
The number of moles of CuSO4 in the original hydrate is therefore 1.59 g / 159.61 g/mol = 0.00997 mol.
The ratio of moles of water to moles of CuSO4 in the original hydrate is:
x = (moles of water) / (moles of CuSO4)
x = (0.91 g / 18.02 g/mol) / 0.00997 mol
x = 5.06
Therefore, the formula of the original hydrate is CuSO4 · 5H2O, and its name is copper (II) sulfate pentahydrate.
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PLEASE HELPPP AOSAPAOPSP
What are some of the difficulties in identifying particular drugs? Why is it important for forensic scientists to be able to identify particular drugs?
some medicines contain legal ingredients like starch and sugar, and forensic scientists must be able to distinguish between the two. Because courts rely on the data forensic scientists find in their research, it is crucial for them to be able to recognise specific substances.
How do you identify forensic drugs?The ideal technique for this evaluation is Gas Chromatography/Mass Spectrometry (GC/MS), which is frequently used in forensic laboratories. The method offers a quick, semi-automated analysis of the material and often produces enough data to pinpoint the problematic substances. To ascertain whether an unlawful substance is present in the supplied material is the aim of forensic drug chemistry. Law enforcement can seek criminal charges based on the study' findings, and the court can decide on the right sentence.
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In science class, savannah measures the temperature of a liquid to be celsius. Her teacher wants her to convert the temperature to degrees fahrenheit. What is the temperature of savannah's liquid to the nearest degree fahrenheit?.
The temperature of savannah's liquid to the nearest degree Fahrenheit is 93.1
Temperature conversion formulas are defined as the conversion formulas for changing the value of temperature from one unit to another. They're colorful distinct temperature conversion styles. Kelvin, Celsius, and Fahrenheit are the most generally used scales for temperature dimension.
In science class, Savannah measures the temperature of a liquid to be 34° Celsius. Her teacher wants her to convert the temperature to degrees Fahrenheit.
The general formula to convert Celsius into Fahrenheit is
[tex]F = (C*\frac{9}{5}) +32[/tex]
Substitute C=34°,
[tex]F = (C*\frac{9}{5}) +32\\\\F = (34*\frac{9}{5}) +32\\\\F = (34*\ 1.8}) +32\\\\F = 61.2 +32\\\\F = 93.1[/tex]
Therefore, The temperature of Savannah's liquid to the nearest degree Fahrenheit is 93.1°.
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divide 124.7 g by 25 cm3 and round off the answer
Answer:
5 g/cm³
Explanation:
When we divide the mass of a substance (124.7 g) by its volume (25 cm³), we are finding its density. Density is defined as the mass per unit volume of a substance and has the unit g/cm³. In this case, dividing 124.7 g by 25 cm³ gives us 4.988 g/cm³.
However, in order to simplify the answer, it is common practice to round off the density value to the nearest whole number. In this case, 4.988 g/cm³ can be rounded off to 5 g/cm³. So, the final answer is 5 g/cm³.
ALLEN
Classify each of the events based on whether the solubility of the gas will increase, decrease, or stay the same.
Increased gas solubility Reduced gas solubility As a body of water's temperature rises, Oz's gas solubility remains unchanged. Air enters the blood when the diver drops 10 meters; an atm of pressure rises.
Gas molecules can more easily leave the solution phase at higher temperatures due to their higher kinetic energy. As a result, solubility declines. A measurement of the concentration of dissolved gas particles in a liquid, solubility is a function of gas pressure. A gas's solubility rises as pressure is increased, but it falls as pressure is decreased due to an increase in collision frequency. The solubility of gases rises with pressure, as one might anticipate. According to Henry's Law, a gas's solubility in a liquid is directly inversely proportionate to the gas's pressure above the surface of the solution. thus this will most effectively release the pressure that has been imposed.
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What effect does a drop in pH during high-intensity interval exercise have on glycogen utilization?
Answer:
During high-intensity interval training, a pH decrease may affect how well glycogen is used. Acidosis, often known as a drop in pH, is a condition that develops when lactic acid builds up in the muscles. The glycogen phosphorylase enzyme, which converts glycogen to glucose, may become inhibited as a result of this acidosis. As a result, glycogen is used less frequently as a source of energy. As a result of this decline in glycogen usage, tiredness and poor performance during intense activity may result. However, the impact of acidosis on glycogen use is poorly understood, and more investigation is needed to identify the underlying mechanism.
Hope it helps! : )Explanation:
Answer:
During high-intensity interval exercise, a drop in pH can affect glycogen utilization in several ways. A decrease in pH, also known as acidosis, can lead to a decrease in the activity of enzymes involved in glycogen metabolism. For example, glycolytic enzymes, which break down glycogen into glucose and other metabolites, are sensitive to changes in pH and their activity may be decreased in acidic conditions.
In addition, acidosis can also reduce the availability of glycogen in muscle cells, as it can cause the breakdown of glycogen into lactate, which can interfere with the normal functioning of the muscle. This, in turn, can lead to decreased energy production and a reduction in the ability of the muscles to perform high-intensity activities.
Explanation:
Therefore, a drop in pH during high-intensity interval exercise can have a negative impact on glycogen utilization, leading to decreased energy production and reduced athletic performance.
Hydrogen iodide decomposes according to the equation shown below. The second order rate constant for this reaction is 1.6 x 10-3 M-1*s-1 at 700 oC. If the initial concentration of HI is 5.1 x 10-2 M, how many seconds will it take for the concentration to be reduced to 4.9 x 10-3 M at 700 oC?
This equation describes how hydrogen iodide breaks down. At 700 degrees Celsius, the reaction's second order constant is 1.6 x 10-3 L mol-1 s-1. if the first
How does hydrogen fuel work?
Energy created from other sources can be transported, transported, and stored using hydrogen. Many processes can be used today to manufacture hydrogen fuel. Nowadays, electrolysis and natural gas reforming, a thermal process, are the two most used techniques. Solar-powered and biological processes are some additional techniques.
What is an atom of hydrogen?
An atom of the element hydrogen is known as a hydrogen atom. A single positively charged neutron and a single negative charge electron are present in the electrically neutral atom, and they are both held to the nucleus by the Electrical charges. Around 75% of the universe's total baryonic mass is made up of atomic hydrogen.
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If the density of tin is 7.26 g/cm^3, what is the thickness of a piece of tin foil that measures 5.00 cm by 5.00 cm and has a mass of 2.722 g
Density and mass concentration have the same numerical value for a pure substance. Density can be important to packaging, purity, and buoyancy because different materials typically have varied densities.
What is density?
At normal temperatures and pressures, osmium and iridium are the densest elements that are currently known.
The dimensionless number "relative density" or "specific gravity," which is the ratio of the material's density to that of a standard material, typically water, is occasionally used to substitute density in order to make density comparisons across different systems of units simpler.
As a result, if a substance has a relative density lower than one in comparison to water, it floats.
We know that
Density = mass / volume
And volume = L*W*H (thickness)
First calculate the volume of foil as follows:
Density = mass / volume
Volume = mass / density
= 2.722 g/ 7.26 g/ cm^3
= 0.375 cm^3
And volume = = L*W*H (thickness)
0.375 cm^3 = 5cm*5 cm * thickness
Thickness = 0.015 cm
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Which of the following is an example of an Arrhenius acid?
A. BF3
B. NaOH
C. HI
D.NH3
Answer:
C. Hl
Explanation:
I just looked it up on the internet lol
what mass in grams, of liquid is in 34.6ML of liquid
Answer: 30.3 g
I had this question..If i hadn't done this I'd be confused.
Consider the ion 41Ca2+, which is calcium-41 with a +2 charge.
How many protons and electrons are there?
How many neurons and mass number are there?
1) There are 18 electrons and 20 protons
2) There are 21 neutrons hence the mass number is 41
How is an ion made from an atom?An ion is created when an atom gains or loses one or more electrons. An atom is composed of a nucleus, which contains positively charged protons and neutral neutrons, and electrons, which orbit the nucleus.
If an atom gains one or more electrons, it becomes negatively charged and is known as an anion. If an atom loses one or more electrons, it becomes positively charged and is known as a cation.
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Convert 0.672ft to millimeters. This is the chart given
Answer: 204.8256 millimeters
Explanation:
Three 1.0 liter flasks were filled with H2, O2 and Ne, respectively, at STP. Which of the following statements is correct?A. Each flask has the same number of gas moleculesB. The velocity (molecular velocity) of the gas molecules is the same in each flask.C. The density of each gas is the sameD. The number of O2 and H2 molecules is twice as large as Ne atoms.e. None of the above is true.
Three 1.0 liter flasks were filled with H2, O2 and Ne, respectively, at STP, the statement true is Each flask has the same number of gas molecules.
STP, or standard temperature and pressure, refers to the nominal atmospheric conditions at sea level. The temperatures and pressures are 0 degrees Celsius and 1 atmosphere, respectively. In addition to other professionals, the STP value is crucial for physicists, chemists, engineers, pilots, and navigators.
STP is frequently used to set standard temperature and pressure conditions, which is crucial for measurements and recording of physical and chemical processes.
It's inversely as important to indicate the applicable reference conditions of temperature and pressure when stating the molar volume of a gas( 41) as it's when expressing a gas volume or volumetric inflow rate. Stating the molar volume of a gas without indicating the reference conditions of temperature and pressure has veritably little meaning and can beget confusion.
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Water is constantly diffusing into the cytosol of freshwater single-celled organisms. In order to maintain the proper solute concentrations in the cytosol, contractile vacuoles pump out the excess water. An experimenter placed single-celled organisms into various saline concentrations and recorded the ATP used by the contractile vacuole. The data are shown in the graph. Of the following, which additional investigation can be used to determine when the cells are in an isotonic solutionA. Decreasing the salinity of the environment a little at a time until the ATP usage reaches a maximum
B. Decreasing the salinity of the environment a little at a time until ATP usage reaches a minimum
C. Increasing the salinity of the environment a little at a time until ATP usage reaches a maximum
D. Increasing the salinity of the environment a little at a time until the ATP usage reaches a minimum
To determine when the cells are in an isotonic solution, the additional investigation that can be used is option B. Decreasing the salinity of the environment a little at a time until ATP usage reaches a minimum.
An isotonic solution is one where the solute concentration outside the cell is the same as the solute concentration inside the cell. In this state, there is no net movement of water into or out of the cell, and the contractile vacuole does not need to pump out excess water. As the salinity of the environment is decreased, the solute concentration outside the cell will decrease, and water will enter the cell, leading to an increase in the workload of the contractile vacuole. However, when the salinity of the environment is decreased to the point where it becomes isotonic with the cytosol of the cell, the workload of the contractile vacuole will reach a minimum, as there is no more excess water to be pumped out.
Therefore, by decreasing the salinity of the environment a little at a time until the ATP usage reaches a minimum, the experimenter can determine when the cells are in an isotonic solution.
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An atom has 15 electrons. Find
i. Number of subshells
ii. Number of orbitals
iii. Number of electrons having azimuthal quantum number = 1
Answer:
Given that an atom has 15 electrons, here's the solution to each part of the problem:
i. Number of subshells:
The number of subshells can be determined by the electron configuration of the atom. The electron configuration of a neutral atom with 15 electrons is 1s2, 2s2, 2p6, 3s2. Thus, there are 4 subshells: 1s, 2s, 2p, and 3s.
ii. Number of orbitals:
The number of orbitals in each subshell can be determined by the value of the principal quantum number (n) and the angular momentum quantum number (l). The number of orbitals in a subshell is equal to 2l + 1.
For the subshell 1s, l = 0, so there is 1 orbital (2 * 0 + 1 = 1).
For the subshell 2s, l = 0, so there is 1 orbital (2 * 0 + 1 = 1).
For the subshell 2p, l = 1, so there are 3 orbitals (2 * 1 + 1 = 3).
For the subshell 3s, l = 0, so there is 1 orbital (2 * 0 + 1 = 1).
So in total, there are 6 orbitals: 1 for 1s, 1 for 2s, 3 for 2p, and 1 for 3s.
iii. Number of electrons having azimuthal quantum number = 1:
The azimuthal quantum number (m_l) represents the orientation of the orbital in space. The value of m_l can range from -l to +l in integer steps. For p orbitals, l = 1, so the possible values of m_l are -1, 0, and 1.
In this case, we're looking for the number of electrons with m_l = 1. In a full p orbital, there are 2 electrons with m_l = -1, 2 electrons with m_l = 0, and 2 electrons with m_l = 1.
Given that the atom has 15 electrons, it means that 2 of the electrons in the 2p subshell are unpaired (since there are an odd number of electrons). So in this case, there is 1 electron with m_l = 1.
Please help me I’ve been stuck on this question for 10 minutes
The arrow shows that the bond between the chlorine atom and the fluorine atom is polar covalent. The electrons in the bond are pulled closer to the fluorine atom, and the chlorine atom is slightly negative.
What is a polar covalent atom?A polar covalent bond is a type of chemical bond that occurs when two atoms share electrons unequally. In a polar covalent bond, the electrons are attracted more strongly to one of the atoms than the other, leading to a separation of electric charge.
The electrons in the bond are pulled closer to the fluorine atom, making it slightly negative, and the chlorine atom becomes slightly positive. This is because fluorine is more electronegative than chlorine, meaning that it has a greater attraction for the shared electrons in the bond.
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Balance the following reaction.
Cu + Ag(NO3) --> Cu(NO3)2 + Ag
If you are given 2.5 grams of copper and 5 g of silver nitrate
What is the Limiting Reactant? __________ (Cu/AgNO3)
How much of each product do you produce?
_________ g Cu(NO3)2
_________ g Ag
Answer:
The balanced chemical equation for this reaction is:
2 Cu + Ag(NO3)2 -> 2 Cu(NO3)2 + Ag
The limiting reactant is the reactant that runs out first and determines the amount of product that can be produced. To determine the limiting reactant, we need to calculate the number of moles of each reactant.
From the given mass of copper, we can calculate the number of moles as follows:
2.5 g Cu / 63.55 g/mol = 0.0395 mol Cu
From the given mass of silver nitrate, we can calculate the number of moles as follows:
5 g AgNO3 / 169.87 g/mol = 0.0295 mol AgNO3
Since 0.0295 mol of AgNO3 is less than 0.0395 mol of Cu, AgNO3 is the limiting reactant.
To calculate the amount of each product produced, we can use the stoichiometry of the balanced equation.
For Ag, the reaction produces 1 mole of Ag for every 2 moles of AgNO3, so we have:
0.0295 mol AgNO3 * 1 mole Ag / 2 moles AgNO3 = 0.0148 mol Ag
And converting moles to grams:
0.0148 mol Ag * 107.87 g/mol = 1.59 g Ag
For Cu(NO3)2, the reaction produces 2 moles of Cu(NO3)2 for every 2 moles of AgNO3, so we have:
0.0295 mol AgNO3 * 2 moles Cu(NO3)2 / 2 moles AgNO3 = 0.0295 mol Cu(NO3)2
And converting moles to grams:
0.0295 mol Cu(NO3)2 * 164.46 g/mol = 4.86 g Cu(NO3)2
Therefore, the limiting reactant is AgNO3 (Cu/AgNO3) and the reaction produces 1.59 g of Ag and 4.86 g of Cu(NO3)2.
3. Imagine that a radioactive isotope has a half-life of 2 years. A sample contains 1000 atoms of
the radioactive isotope. Complete the following table to predict how many atoms of the
radioactive isotope remain in the sample over time.
Time elapsed (years)
Number of radioactive atoms remaining
According to the concept of half-lives, atoms remaining after 2,4,6,8,10 years are 500,250,125,62.5,31.25 atoms respectively.
What is half-life?Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
After 2 years ;1000/2=500 atoms
After 4 years ;500/2=250 atoms
After 6 years ;250/2=125 atoms
After 8 years;125/2=62.5 atoms
After 10 years ;62.5/2=31.25 atoms
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2H2O2(aq) → 2H2O(l) + O2(g)
This reaction is first order, with a half life of 1735 seconds.
What is the instantaneous rate of H2O2 decomposition, when [H2O2] = 0.25 M?
Ans is 1*10^-4, please show work
The decomposition of H2O2 (hydrogen peroxide) can be described by the following reaction:
2H2O2 (aq) → 2H2O (l) + O2 (g)
This reaction follows first-order kinetics, so its rate of reaction is given by the following equation:
Rate = k[H2O2]
Where k is the rate constant and [H2O2] is the molar concentration of H2O2. The half-life of this reaction (the time required for [H2O2] to be reduced to half its initial value) is 1735 seconds.
Given that [H2O2] = 0.25 M, we calculate the rate of reaction as follows:
Rate = k[H2O2] = 1.0 x 10^-4 s^-1 × 0.25M = 2.5 x 10^-5 s^-1
Therefore, the instantaneous rate of H2O2 decomposition, when [H2O2] = 0.25 M, is 2.5 x 10^-5 s^-1.
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What is frequency?
A. the lowest point of the wave in relation the the undisturbed position
B. the number of crests that pass a given point in one second
C. a measure of the electromagnetic field's alignment
D. the highest point of the wave in relation to the undisturbed position
Answer: B
Explanation: The number of waves passing through a point in one second is called frequency.
Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. What mass of each substance is present after 25.24 g of calcium nitrate and 26.30 g of ammonium fluoride react completely?
___ g Calcium nitrate
___ g Ammonium fluoride
___ g Calcium fluoride
___ g Dinitrogen monoxide
___ g Water
