Gas Laws Exam

The table below shows data for the temperature, pressure, and volume of four gas samples. Which two gas samples have the same total number of molecules?

• A and B

• A and C

• B and C

• B and D

A gas occupies a 40.0 mL at 50 K. What volume does it occupy at 300K?

• 182 mL

• 240 mL

• 400 mL

• 424 mL

Which temperature change would cause a sample of an ideal gas to double in volume while the pressure is held constant?

• From 400 K to 200 K

• From 200 K to 400 K

• From 400 °C to 200 °C

• From 200 °C to 400 °C

A gas occupies a volume of 0.20 L at 25 atm. What volume will the gas occupy at 2.5 atm?

• 5.0 L

• 10 L

• 2.0 L

• 50 L

If a gas at 300K occupies 3.60 liters at a pressure of 1.00 atm, what will be its new pressure if the volume is compressed to 2.0 liters at a temperature of 450K?

• 0.83 atm

• 1.2 atm

• 2.7 atm

• 10.8 atm

How many moles of H2 gas would be present if 9.0 L of the gas has a pressure of 2.0 atm and a temperature of 300K?

• 0.37 mol

• 0.73 mol

• 1.46 mol

• 2.92 mol

Which one of the following statements is incorrect according to the kinetic-molecular theory of gases?

• The particle collisions are not elastic and lose kinetic energy over time

• Pressure of gas is due to particle impacts on the walls of the container

• The motion of particles is rapid, constant, random, and always move in straight-line paths.

• Particles of a gas are treated as hard, perfect spheres with insignificant volumes

The volume of a gas is increased from 0.5 L to 4.0 L while the temperature is held constant. The pressure of the gas:

• increases by a factor of four

• decreases by a factor of eight

• increases by a factor of eight

• increases by a factor of two

After a vehicle collision, sodium azide (NaN3) decomposes to form 3.2 moles of nitrogen gas (N2) needed to inflate an airbag. This process is represented by the following balanced chemical equation:

Calculate the volume of the nitrogen-filled bag, if the reaction occurs at 298 K and 1.2 atm

• 29 L

• 45 L

• 65 L

• 4,280 L

Which of the following variables are inversely proportional to each other when all other variables are held constant for a sample of gas?

• Pressure and volume

• Moles and temperature

• Volume and temperature

• Pressure and moles