how many atoms is in Ni(C2H3O2)4

the pH of the given solution is 2.

pH is a measure of the acidity or alkalinity of a solution, and is defined as the negative logarithm (base 10) of the concentration of hydrogen ions (H+) in the solution. pH values range from 0 to 14, with a pH of 7 being neutral, a pH below 7 being acidic, and a pH above 7 being alkaline or basic.

A low pH value indicates a high concentration of hydrogen ions, which makes the solution acidic. A high pH value indicates a low concentration of hydrogen ions, which makes the solution basic. The pH scale is commonly used in many fields, including chemistry, biology, environmental science, and medicine, to describe and quantify the acidity or alkalinity of a solution.
The pH of a solution with a hydronium ion concentration of 0.01 mole per liter can be calculated using the formula:

pH = -log[H3O+]

where [H3O+] is the concentration of hydronium ions in moles per liter.

Substituting the given value, we get:

pH = -log(0.01)

Using a calculator, we get:

pH = 2

Therefore, the pH of the given solution is 2.

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Indoor cooking with biomass fuel is the major source of indoor air pollution in developing countries, causing health risks.

The significant wellspring of indoor air contamination in emerging nations is indoor cooking with biomass as a fuel. Biomass fills, like wood, charcoal, and creature waste, are regularly utilized for cooking and warming in many non-industrial nations. Be that as it may, consuming these powers delivers a scope of poisons very high, including particulate matter, carbon monoxide, and nitrogen oxides, which can have serious wellbeing impacts.

Toxic paints on furnishings and walls, tobacco smoke, manufactured materials in development of structures, and arrival of radon-222 gas are additionally wellsprings of indoor air contamination, yet they are not as predominant in that frame of mind as indoor cooking with biomass fuel. Resolving this issue through clean cooking arrangements and advancing the utilization of cleaner powers can essentially further develop indoor air quality and decrease wellbeing gambles in these districts.

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The steep-rise interval in the weak acid-strong base curve is more pronounced than in the strong acid-strong base curve because the weak acid requires more titrant to be neutralized than the strong acid, so the pH changes more slowly initially.

A. The initial pH for the weak acid-strong base curve is higher than the initial pH for the strong acid-strong base curve.

This statement is inaccurate. In fact, the initial pH for the weak acid-strong base curve is lower than the initial pH for the strong acid-strong base curve. This is because a weak acid has a higher initial pH than a strong acid due to the lower concentration of H+ ions in solution.

B. At the equivalence points, the pH of the weak acid-strong base is greater than the pH of the strong acid-strong base.

This statement is accurate. At the equivalence point of a weak acid-strong base titration, the pH is greater than 7 due to the presence of the conjugate base of the weak acid in solution. At the equivalence point of a strong acid-strong base titration, the pH is 7.

C. At the half-equivalence points, the pH of the weak acid-strong base is greater than the pH of the strong acid-strong base.

This statement is accurate. At the half-equivalence point of a weak acid-strong base titration, the pH is greater than 7 because the solution contains both the weak acid and its conjugate base. At the half-equivalence point of a strong acid-strong base titration, the pH is 7.

D. The steep-rise interval in the weak acid-strong base curve is more pronounced than in the strong acid-strong base curve.

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the minimum mass of Mg(NO₃)₂ required to begin precipitation of MgF₂ is 6.37 × 10⁻³ g/L.

The balanced equation for the precipitation of MgF₂ from Mg(NO₃)₂ and HF is:

Mg(NO₃)₂ + 2HF → MgF₂(s) + 2HNO₃

The concentration of fluoride ions can be found using the equilibrium expression for the dissociation of HF:

HF + H₂O ⇌ H₃O⁺ + F⁻

Ka = [H₃O⁺][F⁻]/[HF]

Since the initial concentration of HF is 0.560 M, the concentration of [H₃O⁺] is negligible compared to [HF] because HF is a weak acid. Therefore, we can simplify the expression to:

Ka = [F⁻][HF]/[HF] = [F⁻]

[F⁻] = Ka = 7.2 × 10⁻⁴ M

Now we need to determine the minimum amount of Mg(NO₃)₂ required to provide enough fluoride ions to reach the saturation point of MgF₂.

Let's assume x moles of Mg(NO₃)₂ is added to 1.00 L of 0.560 M HF solution. This will result in the addition of 2x moles of F⁻ ions to the solution.

The molar solubility of MgF₂ is equal to the square root of Ksp because the stoichiometric coefficients are 1 for both MgF₂ and Mg(NO₃)₂.

Molar solubility of MgF₂ = sqrt(Ksp) = sqrt(7.4 × 10⁻⁹) = 8.6 × 10⁻⁵ M

To reach saturation, the concentration of F⁻ ions must be equal to the molar solubility of MgF₂. Therefore:

[F⁻] = 8.6 × 10⁻⁵ M = 2x moles/L

x = 4.3 × 10⁻⁵ moles/L

The mass of Mg(NO₃)₂ required is then:

mass = moles × molar mass = (4.3 × 10⁻⁵ mol/L) × (148.3 g/mol) = 6.37 × 10⁻³ g/L.

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The pulmonary diffusion capacity of carbon monoxide (DLCO) is used to determine the transfer of gases through the lungs. The amount of carbon monoxide absorbed by hemoglobin in the lungs is measured in this method.

Carbon monoxide has a higher diffusion coefficient than oxygen, and it is 20-30 times more soluble than oxygen. These differences affect the interpretation of DLCO results. Hemoglobin is a molecule that is critical in the transportation of oxygen and carbon monoxide. Hemoglobin is known to bind with carbon monoxide 240 times more readily than oxygen. In this method, hemoglobin plays a critical role. It is assumed that 100 percent of inhaled carbon monoxide is absorbed into the bloodstream and that the hemoglobin-CO complex forms reversible binding without causing an alteration in the blood's oxygenation level.

The DLCO measurement is based on the following assumptions: At sea level, the concentration of carbon monoxide is zero in the blood being analyzed. The solubility of carbon monoxide in blood is 20-30 times greater than that of oxygen, indicating that it is dissolved in the blood more easily. The alveolar-capillary barrier's thickness is consistent throughout the lung's entire surface area. The diffusion capacity is determined solely by the exchange of gases through the alveolar-capillary membrane and the available hemoglobin in the blood.

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Smog is a result of the interaction between different pollutants, it does not belong to the major classes of outdoor pollutants.

Let me briefly explain each major class of outdoor pollutant:

1. Carbon oxides: This group includes carbon monoxide (CO) and carbon dioxide (CO2). Carbon monoxide is a toxic gas produced by the incomplete combustion of fuels, while carbon dioxide is a greenhouse gas released from various human activities like the burning of fossil fuels.

2. Suspended particles: These are tiny solid or liquid particles suspended in the air, also known as particulate matter (PM). They can be emitted from various sources like construction activities, vehicle emissions, and industrial processes. Suspended particles can cause respiratory issues and other health problems.

3. Nitrogen oxides: This group includes nitrogen dioxide (NO2) and nitric oxide (NO), which are mainly emitted from vehicle exhausts and industrial processes. Nitrogen oxides contribute to the formation of smog, acid rain, and can cause respiratory problems.

4. Sulfur oxides: Sulfur dioxide (SO2) is the primary sulfur oxide, and it is released from burning fossil fuels, especially coal and oil, and from industrial processes. Sulfur oxides contribute to the formation of acid rain and can also cause respiratory problems.

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The solubility of AgCl in the given solution is 1.26 x 10⁻⁸ M.

The reaction is,

AgCl(s) ⇌ Ag⁺(aq) + Cl⁻(aq)

Ksp = [Ag⁺][Cl⁻] = 1.61 x 10⁻¹⁰

SrCl₂ dissociates as follows:

SrCl₂(s) ⇌ Sr²⁺(aq) + 2Cl⁻(aq)

Since the reaction between AgCl and SrCl₂ does not involve the Sr²⁺ ion, its concentration can be considered constant and omitted from the equilibrium expression.

The solubility of AgCl in a solution of 3.42 x 10⁻⁴ M SrCl₂ is given by the following equation:

Ksp = [Ag⁺][Cl⁻] = x(2x + 3.42 x 10⁻⁴)

where x is the molar solubility of AgCl.

Solving for x,

x = 1.26 x 10⁻⁸ M

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The pH of the solution prepared by adding 0.020 moles of Na₂HPO₄ and 0.010 moles of NaH₂PO₄ to 100.0 ml of water is found to be 7.51.

A solution is prepared by adding 0.020 moles of Na₂HPO₄ and 0.010 moles of NaH₂PO₄ to 100.0 ml of water.

The total H⁺ concentration of the solution will be given as,

H⁺= √(Ka₁C₁)+(Ka₂C₂)

C₁ and C₂ are the concentration of the two acids. The Ka₁ and Ka₂ are the standard values of the solution. Putting all the values in the above mentioned formula we will get the pH of the solution to be 7.51.

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Both Ba and Sr belong to the same group of elements in the periodic table Oxygen and selenium both belong to group 16 of the periodic table Nitrogen and arsenic belong to the same periodic table group of elements.

Ba and Sr both have two valence electrons in their outermost shell and belong to the same group of elements in the periodic table, the alkaline earth metal group.

This similarity in electron arrangement leads to similar chemical properties.

Nitrogen and arsenic belong to group 15 of the periodic table, also known as the nitrogen group. Both elements have five valence electrons in their outermost shell, and their shared electron arrangement contributes to similar chemical properties such as their ability to form compounds with three other atoms.

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The term absorbance is directly proportional to the concentration (c) of the solution which is used in the experiment of the spectra.

The absorbance is defined as the term which is said to be directly proportional to the length of the light path that is equal to the width of the cuvette. The relationship between concentration and absorbance can be explained by the Beer-Lambert law. This law relates the attenuation of light to the properties of a material. The Beer-Lambert law is defined as the law which states that the concentration of a chemical solution is directly proportional to its absorption of light.

The acid dissociation constants were determined in the spectra will be 2.97 pKa* and 9.47 pKa. The pKa and pKa* values are corresponded well with literature values of 9.45 and 3.0 with a 0.2 and 1.0% difference, respectively. This was determined that 2-naphthol is a weaker acid in the ground state than the excited state due to the value of  pKa > pKa.

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Answer:

I think that the moon's rotation around the Earth shows us different parts of the moon

Explanation:

Answer:

The biggest clue to why the Moon always looks different when you look up at the sky is that it is constantly moving in relation to Earth and the Sun.

Explanation:

Answer:

Explanation:

The ocean is a huge body of salt water that covers about 71 percent of Earth’s surface. The planet has one global ocean, though oceanographers and the countries of the world have traditionally divided it into four distinct regions: the Pacific, Atlantic, Indian, and Arctic oceans. Beginning in the 20th century, some oceanographers labeled the seas around Antarctica the Southern Ocean, and in 2021 National Geographic officially recognized this fifth ocean.

An estimated 97 percent of the world’s water is found in the ocean. Because of this, the ocean has a considerable impact on weather, temperature, and the food supply of humans and other organisms. Despite its size and impact on the lives of every organism on Earth, the ocean remains a mystery. More than 80 percent of the ocean has never been mapped, explored, or even seen by humans. A far greater percentage of the surfaces of the moon and the planet Mars has been mapped and studied than of our own ocean floor.

Although there is much more to learn, oceanographers have already made some amazing discoveries. For example, we know that the ocean contains towering mountain ranges and deep canyons, known as trenches, just like those on land. The peak of the world’s tallest mountain—Mount Everest in the Himalayas, measuring 8.84 kilometers (5.49 miles) high—would not even break the surface of the water if it was placed in the Pacific Ocean’s Mariana Trench or Philippine Trench, two of the deepest parts of the ocean.

The rate at which the water expands continues to increase until it reaches the freezing temperature of 0°C or 32°F.

When the temperature of ice-cold water is increased slightly, it undergoes a net contraction. In the case of water, the density of water is at a maximum at 4°C or 39°F. This implies that, as the temperature of water decreases, its density will increase until it reaches 4°C. As a result, the water will begin to expand again.

As a result, when the temperature of ice-cold water is increased slightly, it will undergo a net contraction.According to the Density Anomalies of Water experiment, as the temperature of water decreases, its density increases.

Water achieves its maximum density at 4°C or 39°F. When the temperature of water falls below 4°C, the water starts to expand. At this point, the water begins to freeze, causing a further expansion in volume.

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The transition state for the following SN2 reaction CI + NaSH ---> SH + NaCI is option III.

Transition state in a chemical reaction can be referred to as a molecular configuration that describes the point of maximum energy in the reaction path during which the bonds that are involved in the chemical reaction are in a state of change.

Transition state theory provides detailed explanations of the reaction rates and reaction mechanisms occurring in the gas phase.

The reaction mechanism in question is a substitution reaction in which the hydroxyl ion attacks the alkyl halide, resulting in the creation of an intermediate complex.

The complex is created in a transition state involving the transfer of a negatively charged ion, which will lead to a new bond forming with the incoming nucleophile.

In conclusion, the transition state for the following SN2 reaction CI + NaSH ---> SH + NaCI is option III.

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Answer: The heat capacity of a bomb calorimeter is 500 J°C.

The molarity of the HCl sample is 1.0 M.

In a titration, the moles of acid are equal to the moles of base at the equivalence point.

We can use this principle to calculate the molarity of the acid (HCl) from the volume and concentration of the base (NaOH) used in the titration.

First, we need to calculate the number of moles of NaOH used in the titration:

moles of NaOH = M x V = 0.20 M x 0.025 L = 0.005 mol

Since NaOH and HCl react in a 1:1 molar ratio, the number of moles of HCl present in the sample is also 0.005 mol.

Now we can calculate the molarity of HCl using the number of moles and the volume of the HCl sample used in the titration:

molarity of HCl = moles of HCl / volume of HCl sample

molarity of HCl = 0.005 mol / 0.005 L

molarity of HCl = 1.0 M

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The balanced molecular equation when nitrosyl chloride gas, NOCI, is heated to produce gaseous chlorine and nitrogen monoxide is:

2NOCl(g) ⇔ Cl₂(g) + 2NO(g)

Chemical equation is simply a ritrogen monoxide epresentation of chemical reactions using the symbols and formula of elements. We must understand, that every reaction has two sides i.e reactants and products.

The balancing of chemical equation must obey the law of conservation of matter other wise, atoms will either be created or destroyed during the reaction.

Now we shall write the balanced molecular equation for the reaction invoving the heating of nitrosyl chloride gas, NOCI. Details below:

Nitrosyl chloride gas ⇔ Gaseous chlorine + Nitrogen monoxide

NOCl(g) ⇔ Cl₂(g) + NO(g)

There are 2 atoms of Cl on the right and 1 atom on the left. It can be balanced by writing 2 before NOCl as shown below:

2NOCl(g) ⇔ Cl₂(g) + NO(g)

There are 2 atoms of N on the left and 1 atom on the right. It can be balanced by writing 2 before NO as shown below:

2NOCl(g) ⇔ Cl₂(g) + 2NO(g)

Thus, the equation is balanced.

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We get the dark blue color precipitate which contains  [tex]Cu(NH3)4]^{2+}[/tex](aq.) complex ions of the solution when 6 M Na OH is added.

When the 6M Na OH is used instead of the NH3 in a solution then [tex]Cu^{2+}[/tex]ions will be precipitate out as the [tex]Cu(OH)_{2}[/tex]  in the solution. When the NH3 is used the [tex]Cu^{2+}[/tex] ions will form a complex with the NH3 in the solution which can be expressed as,

[tex]Cu^{2+}[/tex] + [tex]4NH_{3}[/tex] ----> [[tex]Cu(NH3)4]^{2+}[/tex] (aq.) + 2[tex]OH^{-}[/tex](aq.)

The complex of the [tex]Cu^{2+}[/tex]  is soluble which gives dark blue color to the solution.

Therefore by using the 6 M Na OH we can get the blue precipitate of the  [tex]Cu(OH)_{2}[/tex] . Precipitation is defined as the process of transforming a dissolved substance of the solution into an insoluble solid. The solid formed is called the precipitate of the solution.

and by using the NH3 we can get the dark blue color of the solution that contains  [tex]Cu(NH3)4]^{2+}[/tex](aq.) complex ions of the solution.

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The correct question is,

Instead of conc. NH3 being added to the solution, 6 M Na OH is added (both are bases). How will this affect the test for the identification of copper(II) ion in the solution. Explain

Heat manufacturing is a feature of metabolism. Most of the warmth produced in the body is generated in the liver, brain, heart, and skeletal muscle mass all through exercise.

In our body, cellular respiration leads to formation of water, carbon dioxide and launch of energy. This energy is stored in the shape of ATP. Some structure of this strength is utilised in day by day things to do and the excess is launched in the form of heat.

Cooling Your Body

Convection happens when warmness is carried away from your body by means of shifting air. If the surrounding air is cooler than your skin, the air will absorb your heat and rise.

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The given statement {When 7.5 x 10^-4 g of KOH is dissolved in 1.00 L of 1.0 x 10^-10 M Cu(NO3)2, a precipitate of Cu(OH)2 is formed} is True. This is because the Ksp of Cu(OH)2 (2.2 x 10^-20) is exceeded, leading to the formation of a precipitate. So the answer is true.

When 7.5 x 10-4 g of KOH is dissolved in 1.00 L of 1.0 x 10-10 M Cu(NO3)2, a precipitate of Cu(OH)2 is formed. This statement is true.

The equation is given below:

Cu(NO3)2 + 2KOH → Cu(OH)2 + 2KNO3, the given Ksp value for Cu(OH)2 is 2.2 x 10-20.

Molarity of Cu(NO3)2 is given by:

M = (1.0 x 10-10 mol/L) = moles of solute/L of solution= n/1.0 L1.0 x 10-10 = n/1.0 n = 1.0 x 10-10 mol

Amount of KOH is given by: Molarity of KOH = moles of solute/L of solution M = 7.5 x 10-4 g/(56.11 g/mol)/1.0 L= 1.336 x 10-5 mol/L, the balanced equation shows that the ratio of Cu(NO3)2 to KOH is 1:2.

Thus, moles of KOH = 2 x moles of Cu(NO3)2. Hence moles of Cu(NO3)2 = 1.0 x 10-10 mol/L x 1.0 L = 1.0 x 10-10 mol.

Moles of KOH = 2 x 1.0 x 10-10 mol = 2.0 x 10-10 mol.

Now we have the amount of both Cu(NO3)2 and KOH used in the reaction. The Ksp of Cu(OH)2 is given as 2.2 x 10-20.

The formula of Ksp is;

Ksp = [Cu2+][OH-]2Cu2+ and OH- are produced in a 1:2 molar ratio according to the balanced equation.

Therefore, [Cu2+] = 1.0 x 10-10 mol/L and [OH-] = 2 x 2.0 x 10-10 mol/L = 4.0 x 10-10 mol/L.

The value of Ksp is calculated as follows:

Ksp = [Cu2+][OH-]2= (1.0 x 10-10 mol/L)(4.0 x 10-10 mol/L)2= 1.6 x 10-28 mol3/L3.

This Ksp value is less than the given Ksp of Cu(OH)2 (2.2 x 10-20), which implies that a precipitate of Cu(OH)2 will form, and the statement is true.

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If I contain 3 moles of gas in a container with a volume of 60 liters and at a temperature of 400 K,The pressure inside the container is approximately 16.42 atm.

Using the Ideal Gas Law, we can calculate the pressure inside the container. The Ideal Gas Law is expressed as PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

In this case, you have 3 moles of gas (n = 3), a volume of 60 liters (V = 60 L), and a temperature of 400 K (T = 400 K). The gas constant (R) for this equation is 8.314 J/(mol·K), but since we are using liters and atm, we need to use the value 0.0821 L·atm/(mol· K).

Now, we can plug the values into the equation:

P × 60 L = 3 mol × 0.0821 L·atm/(mol·K) × 400 K

To find the pressure (P), we will rearrange the equation and solve for P:

P = (3 mol × 0.0821 L·atm/(mol·K) × 400 K) / 60 L

P ≈ 16.42 atm

So, the pressure inside the container is approximately 16.42 atm.

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A solutions that is highly reactive & consists ions— molecules or atoms that also have received or exchanged electrons—is an electrolyte solution.

Since the final cost on I equal the net cost on (ii), the electrolytic mixture is always neutral (iii). Unlike with the superconductor, the sodium chloride conducts the electrical charge by virtue of progression of its (iv). The characteristic that causes a metal to prefer to dissolve in positive charge is defined as (v).

Substances known as electrolytes show a natural positive or negative static electricity when submerged in water. Several body activities are supported by them, including controlling nuclear reactions or preserving overall proportion of liquids both inside and outside your cells.

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In the following chemical reaction, the solution was supplemented with 8.01g of magnesium sulfate.

We must utilize the following chemical formula to determine how magnesium sulfate and sodium hydroxide react to solve this issue:

MgSO4 + 2 NaOH → Mg(OH)2 + Na2SO4

One mole of magnesium sulfate (MgSO4) interacts with two moles of sodium hydroxide (NaOH), resulting in one mole of magnesium hydroxide (Mg(OH)2) and one mole of sodium sulfate, according to the equation (Na2SO4).

We must utilize the solution's concentration and volume to determine how many moles of NaOH are present in the solution:

C = n/V

where n is the number of moles, V is the volume in liters, and C is the concentration in moles per liter.

n(NaOH) = C × V

               = 1 mol/L × 0.133 L  

               = 0.133 mol.

We require half as many moles of MgSO4 as we do of NaOH since their mole ratio is 1:2:

n(MgSO4) = 0.5 × n(NaOH)

                 = 0.5 × 0.133 mol

                 = 0.0665 mol

Using its molar mass, we can finally translate the quantity of MgSO4 from moles to grams:

m(MgSO4) = n(MgSO4) × M(MgSO4)

                  = 0.0665 mol × 120.4 g/mol = 8.01 g

Therefore the solution was supplemented with 8.01g of magnesium sulfate.

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The molar mass corresponds to the chlorofluorocarbon CF3Cl (Freon-11), which has a molar mass of 137.37 g/mol. Therefore, the chlorofluorocarbon in the experiment is CF3Cl.

The rate of effusion of a gas through a porous barrier is inversely proportional to the square root of its molar mass. Therefore, we can use the rate of effusion to determine the relative molar mass of the two gases and identify which one is a chlorofluorocarbon.

The rate of effusion can be calculated using Graham's law:

Rate of effusion = Volume of gas / Time taken to effuse

For the chlorofluorocarbon, the rate of effusion is:

Rate of effusion (CFC) = 50 mL / 157 s = 0.3185 mL/s

For argon, the rate of effusion is:

Rate of effusion (Ar) = 50 mL / 76 s = 0.6579 mL/s

Using Graham's law, we can set up the following equation:

Rate of effusion (CFC) / Rate of effusion (Ar) = sqrt(Molar mass (Ar) / Molar mass (CFC))

Solving for the ratio of molar masses:

Molar mass (Ar) / Molar mass (CFC) = (Rate of effusion (Ar) / Rate of effusion (CFC))^2

Molar mass (Ar) / Molar mass (CFC) = (0.6579 mL/s / 0.3185 mL/s)^2

Molar mass (Ar) / Molar mass (CFC) = 4.294

Molar mass (CFC) = Molar mass (Ar) / 4.294

The molar mass of argon is 39.95 g/mol. Therefore, the molar mass of chlorofluorocarbon is:

Molar mass (CFC) = 39.95 g/mol / 4.294 = 9.30 g/mol

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The final volume of the gas is approximately 7.97 L. This type of process is often represented on a pressure-volume (PV) diagram as a horizontal line, where the pressure is constant and the volume changes.

What is Constant Pressure?

Constant pressure refers to a thermodynamic process where the pressure of the system remains constant throughout the process. This means that if a gas is undergoing a constant pressure process, its pressure will remain the same, but its volume, temperature, and other properties may change. In a constant pressure process, the system can exchange heat with its surroundings, but the pressure remains constant.

We can use Charles's Law to solve this problem, which states that at constant pressure, the volume of an ideal gas is directly proportional to its temperature in Kelvin.

We can set up a proportion:

(V₁/T₁) = (V₂/T₂)

where V₁ is the initial volume (5.31 L), T₁ is the initial temperature (200 K), V₂ is the final volume (what we want to find), and T₂ is the final temperature (300 K).

Solving for V₂:

V₂ = (V₁/T₁) x T₂

V₂ = (5.31 L / 200 K) x 300 K

V₂ = 7.965 L

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When Muhammad died, his followers carried on the new religion. Islam prospered and grew under the Caliph Abu-Bakr and those who followed him. What cities became hubs of Muslim thought and power? How did word of this new religion spread? Did it appeal to people outside the Arabian Peninsula?

Explanation:

Answer: 499.2g of O2

Explanation:CO2 + O2 ---> CO2 +H20

From the equation, we know 1 mole of oxygen requires 1 mole of CO2 to react completely.

Therefore it is sure that 15.6 mole of CO2 requires 15.6 moles of O2

To convert moles of O2 to grams, we need to use the molar mass of O2

i.e. 32.00g/mol

the mass of O2 required is

15.6 moles *32.00 g/mol = 499.2g