Gas Laws Exam Review

What is the ideal gas law equation?

• a) PV = nRT
• b) PV = RT/n
• c) PV = n/T
• d) P = V/nRT

Which gas constant (R) value should be used if pressure is given in atmospheres (atm)?

• a) 8.31 L∙atm/mol∙K
• b) 0.0821 L∙atm/mol∙K
• c) 62.4 mmHg/L∙mol∙K
• d) 0.0821 mmHg/L∙mol∙K

A sample of gas occupies a volume of 5.00 L at a pressure of 1.20 atm and a temperature of 300 K. How many moles of gas are present?

• a) 0.10 mol
• b) 2.41 mol
• c) 0.24 mol
• d) 6.00 mol

What is the volume occupied by 2.50 moles of a gas at 3.00 atm and 25°C?

• a) 0.143 L
• b) 20.0 L
• c) 0.0500 L
• d) 30.0 L

At what temperature will 0.50 moles of a gas occupy 22.4 L at 1 atm pressure?

• a) 273.15 K

• b) 0 K

• c) 546.3 K

• d) 298 K

What is the pressure exerted by 0.25 moles of a gas at 298 K in a 5.00 L container?

• a) 1.21 atm

• b) 2.46 atm

• c) 0.61 atm

• d) 4.92 atm

A gas occupies a volume of 2.0 L at a temperature of 25°C. If the temperature is decreased to 1°C, what will be the new volume of the gas, assuming constant pressure?

• A) 0.08 L
• B) 1.0 L
• C) 1.6 L
• D) 2.5 L

If the volume of a gas is 10.0 L at 20°C, what will be its volume at 40°C, assuming constant pressure?

• A) 10.0 L
• B) 12.5 L
• C) 20.0 L
• D) 25.0 L

If a gas occupies a volume of 6.0 L at 273 K, what will be its volume at 473 K, assuming constant pressure?

• A) 4.6 L
• B) 6.4 L
• C) 8.0 L
• D) 10.4 L

A gas has a volume of 2.5 L at 263 K. If the temperature is increased to 313 K, what will be its new volume, assuming constant pressure?

• A) 1.25 L
• B) 3.0 L
• C) 3.75 L
• D) 5.0 L