Worksheet - Mixed Gas Law Worksheet



Gas Laws

SHOW ALL WORK FOR ALL PROBLEMS

Chapter 12: Graham’s Law and Dalton’s Law of Partial Pressures

1. How fast would a mole of sulfur dioxide travel if a mole of krypton travels an average of 750 m/s. (Both gases are at 200. o C?)

Law: _______________________________

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2. A fluorine gas molecule travels at about 300. m/s at room temperature. How fast would a molecule of methanol, CH3OH, travel at the same temperature?

Law: _______________________________

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3. Which gas diffuses faster at the same temperature, carbon dioxide or xenon? To three significant figures, how much faster does it diffuse? We are solving for the ratio of the rates of diffusion. In this type of problem it is generally understood that, unless told otherwise, we are comparing the faster moving gas, the lighter gas, to the slower moving gas, the heavier gas. Thus, since carbon dioxide is the lighter gas, it will diffuse faster. Therefore, we will make gas 1 carbon dioxide.

Law: _______________________________

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4. Which gas diffuses faster at the same temperature, nitrogen or ammonia (nitrogen trihydride)?

To three significant figures, how much faster does it diffuse?

Law: _______________________________

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5. An unknown noble gas effuses through an opening at a rate 0.3165 times that of helium gas. What is the molecular mass and identity of this unknown gas?

Law: _______________________________

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6. A mixture of He, Ne and Ar gases have a total pressure of 790 mmHg. If there is 15% Ar, 60% He and 25% Ne, what is the partial pressure of each gas?

Law: _______________________________

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7. What is the partial pressure of carbon dioxide in container that holds 5.0 moles of CO2, 3.0 moles of N2, and 1.0 mole of H2 and has a total pressure of 1.05 atm?

Law: _______________________________

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8. The partial pressure of CO2 in a mixture of gases is 0.8 atm. If the total pressure is 1.05 atm, what is the percent of CO2 in the mixture?

Law: _______________________________

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Chapter 13

Pressure units: 1.0 atm = 101.3 kPa = 760 torr pick R to match P units

Temperature units: 0(C = 273 K All gas laws require Kelvin

First identify each number with P, V, T or mass unit. Second state whose law you are using, Third – show the equation, Fourth solve the problem, and write your final answer on the line. Make sure you don't forget your units!!!

13.1

1. The gas in a sealed can is at a pressure of 3.00 atm at 25(C. A warning on the can tells the user not to store the can in a place where the temperature will exceed 52(C.

What would the gas pressure in the can be at 52(C? Law: _______________________________

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2. A sample of neon gas occupies a volume of 752 mL at 25(C. What volume will the gas occupy at standard temperature if the pressure (STP)remains constant?

Law: _______________________________

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3. A sample of oxygen gas has a volume of 150 mL when its pressure is 440 torr. If the pressure is increased to 760 torr and the temperature remains constant, what will the new gas volume be?

Law: _______________________________

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4) A balloon with a volume of 4.50 L at sea level and 35.0 oC is released into the air. As it travels into the upper atmosphere, what volume will the balloon have if the temperature drops to 10.0 oC and a pressure of 0.65 atm?

Law: _______________________________

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13.2

4) How many moles of a gas can be contained

in a 750.00 mL flask at 20.0 oC and 109.00 kPa? Law: _______________________________

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5) A sample of a gas has 1.250 moles and occupies a 200.0 L container under 150.0 kPa. What is the temperature of the gas in Celsius?

Law: _______________________________

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6) At standard pressure, 2.63 grams of a gas are collected at 20.0 oC. If this sample occupies 1.61 L, what is the molecular mass of the gas?

What is the identity of the gas? Law: ______________________________

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7) What is the density of CO2 gas at 95.0 kPa and 295.0 K? Law: _______________________________

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13.3

8) Ammonium nitrate decomposes explosively to produce nitrogen gas, water vapor and oxygen gas. How many grams of ammonium nitrate are needed to produce 40.0 L of nitrogen gas at STP?

Law: _______________________________

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9) Nitrogen and hydrogen combine to form ammonia gas (NH3) which is easily converted into fertilizer. If 120.0 L of nitrogen are used, how many grams of ammonia will be produced if the reaction occurs at 100.00 kPa and 25.0 oC?

Law: _______________________________

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10. The liquid hydrazine (N2H4) is used as rocket fuel. It reacts with oxygen to form nitrogen gas and water. How many liters of nitrogen can be formed from 100.0 g of hydrazine at 295 K and 1.5 atm?

Law: _______________________________

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