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Exam 8: Gases

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Question 21

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A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure.What is the final volume if the initial volume is 310.mL?

A) 0.186 L
B) 0.251 L
C) 0.383 L
D) 0.410 L
E) 0.517 L

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Question 22

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A sample of a gas occupies 1.40 L at 25°C and 760 mmHg.What volume will it occupy at the same temperature and 380 mmHg?

A) 2.8 L
B) 2.10 L
C) 1.40 L
D) 1.05 L
E) 0.700 L

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Question 23

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The pressure of hydrogen sulfide gas in a container is 3.565 ×10⁴ Pa.What is this pressure in torr? (1 atm = 101,325 Pa = 760 torr) ?

A sample of a gas has an initial pressure of 0.987 atm and a volume of 12.8 L.What is the final pressure if the volume is increased to 25.6 L?

If 25.5 L of oxygen are cooled from 150^°C to 50^°C at constant pressure, what is the new volume of oxygen?

What is the formula which describes the relationship between the pressure, volume, temperature, and moles?

A sample of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L.What will the gas pressure be if the volume is increased to 321 L at 125°C?

Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100 cm³ at 95°C and 1000 mmHg (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg) .

What is the initial pressure of a gas having an initial temperature of 905 K, an initial volume of 14.3 L, a final pressure of 0.83 atm, a final temperature of 154 K and a final volume of 2.7 L?

The pressure of sulfur dioxide in a container is 159 kPa.What is this pressure in atmospheres? (1 atm = 101,325 Pa = 760 torr) ?

Determine the partial pressure of N₂ in a gas mixture composed of 1.0 mol of N₂ and 1.5 mol of Ar.The mixture is at 0.0ºC in a 10.0-liter container.

Gases are sold in large cylinders for laboratory use.What pressure is exerted by 2.500 kg of oxygen gas (O₂) stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

Determine the mole fraction of CO₂ in a gas mixture composed of 10.0 grams of CO₂ and 10.0 grams of helium.The mixture is at 75ºC in a 12.0-liter container.

What is the molar mass of an unknown gas if a sample weighing 0.389 g is collected in a flask with a volume of 102 cm³ at 97°C and at a pressure of 728 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg) .

A gas cylinder containing 1.50 mol compressed methane has a volume of 3.30 L.What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C? (R = 0.08206 L • atm/K • mol)

A gas evolved during the fermentation of sugar was collected at 22.5°C and 702 mmHg.After purification its volume was found to be 25.0 L.How many moles of gas were collected? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg)

How many molecules of N₂ gas are present in a 2.5-L flask at 50°C and 650 mmHg? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg, 1 mole = 6.022 × 10²³ molecules)

Determine the partial pressure of helium in a gas mixture composed of 10.0 grams of CO₂ and 10.0 grams of helium.The mixture is at 75ºC in a 12.0-liter container.

A sample of nitrogen gas has a volume of 32.4 L at 20°C.The gas is heated to 220ºC at constant pressure.What is the final volume of the nitrogen gas?

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr.What is its volume at STP? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)