Problem One
What pressure is necessary to increase the volume of 1.0 L of a gas at a pressure of 450 torr to a solume of 10 L?

a) 4500 torr           b) 45 torr           c) 760 torr

Problem Two
A 1.0 L sample of a gas is at a pressure of 2 atmospheres. What volume will the sample have at a pressure of 1 atmosphere?

a) 0.5 L           b) 1.0 L           c) 2.0 L

Problem Three
A 1.0 L sample of a gas is at a temperature of 273 K. What will the volume be if the temperature is increased to 546 K?

a) 0.5 L           b) 1.0 L           c) 2.0 L

Problem Four
A 1.0 L sample of a gas is at a temperature of 25 °C and a pressure of 670 torr. If the volume is kept constant and the temperature is increased to 50 °C, what will the new pressure be?

a) 1340 torr           b) 335 torr           c) 726 torr

Problem Five
A 1.0 L sample of a gas is at a temperature of 100 K and a pressure of 1.0 atm. If the temperature is increased to 200 K and the pressure is increased to 2.0 atm, what will the new volume be?

a) 2.0 L           b) 1.0 L           c) 2.0 L

Problem Six
A 1.0 L sample of a gas is at a temperature of 100 K and a pressure of 0.50 atm. When the conditions are changed to STP, what is the new volume?

a) 1.4 L           b) 2.7 L           c) 0.50 L

Problem Seven
A 1.0 L sample of a gas is at a temperature of 25 °C and a pressure of 670 torr. How many moles of the gas are present?

a) 0.036 mole           b) 0.050 mole           c) 0.066 mole

Problem Eight
A 2.8 g sample of N₂ occupies a volume of 2.2 L at 0.0 °C. What is the pressure of the sample?

a) 0.5 atm           b) 1.0 atm           c) 2.0 atm

Problem Nine
A 2.8 g sample of a compound occupies a volume of 2.2 L at 0.0 °C and 1.0 atm. What is the molecular weight of the compound?

a) 28 g/mole           b) 44 g/mole           c) 66 g/mole

Problem Ten
A 0.10 g sample of N₂ is present with 0.20 mole of O₂. The total pressure of the mixture is 1.0 atm. What is the partial pressure of O₂?

a) 0.33 atm           b) 0.20 atm           c) 0.67 atm

Problem Eleven
A sample of carbon dioxide has a volume of 200 mL at -10 °C and a pressure of 670 torr. What volume will the sample have at -10 °C and 230 torr?

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Problem Twelve
A sample of carbon dioxide has a volume of 200 mL at -10 °C and a pressure of 670 torr. What volume will the sample have at 50 °C and 670 torr?

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Problem Thirteen
A sample of carbon dioxide has a volume of 200 mL at -10 °C and a pressure of 670 torr. What volume will the sample have at 50 °C and 230 torr?

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Problem Fourteen
A sample of carbon dioxide has a volume of 200 mL at -10 °C and a pressure of 670 torr. How many grams of carbon dioxide are present in the sample?

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Problem Fifteen
What is the density of carbon dioxide at STP?

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Problem Sixteen
What is the density of carbon dioxide at 500 torr and 50 °C?

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Problem Seventeen
What volume of carbon dioxide will contain 6 x 10²² molecules at 500 torr and 50 °C?

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Problem Eighteen
A sample of N₂ occupies 500 mL at 25 °C and 350 torr. What pressure is required at a temperature of 100 °C to achieve a volume of 1000 mL?

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Problem Nineteen
A 1.0 g sample of ethane (C₂H₆) occupies 1.0 L at a temperature of 25 °C. What is the pressure of the gas?

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Problem Twenty
A gas has a density of 1.67 g/L at 35 °C and 700 torr. What is the molecular weight of the gas.

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Problem Twenty One
A 0.450 g sample of a gas occupies 2.05 L at 0.0 °C and 0.5 atmospheres. What is the molecular weight of the gas?

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Problem Twenty Two
The composition of air is approximately 21% oxygen, 78% nitrogen, and 1% argon. If the total pressure is 1.0 atmosphere, what is the partial pressure of argon?

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Problem Twenty Three
If 1.6 g of methane (CH₄) at a pressure of 600 torr is collected over water at 25 °C, what volume is collected? [The vapor pressure of water at 25 °C is 25 torr.]

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Problem Twenty Four
A classroom is 20 m long, 10 m wide, and 3 m high. The temperature is a balmy 30 °C and the relative humidity is 85%. How many grams of water are in the air? [Relative humidity is the ratio of the vapor pressure of water in the air to the vapor pressure of pure water. The vapor pressure of water at 30 °C is 32 torr.]

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