Quiz Thermodynamics: Ideal and Real Gases

Which of the following is not one of the assumptions of the kinetic molecular theory for ideal gases?

• The particles attract and then repel each other.
• The collisions between particles are elastic
• The particles are in constant random motion.
• The particle size is very small compared to the space between the particles.

Under which conditions is a gas most likely to behave ideally?

• low pressure

• low temperature

• high pressure

• low volume

Calculate the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm.

• 7.18 L 
• 7.81 L
• 4.63 L
• 4.36 L

Determine the Kelvin temperature required for 0.0470 mol of gas to fill a balloon to 1.20 L under .998 atm pressure. 

• 0 K 
• 107 K 
• 207 K 
• 307 K 

Determine the Celsius temperature of 2.49 moles of gas contained in a 1.00-L vessel at a pressure of 143 kPa. 

• -266 degrees C
• -622 degrees C
• 622 degrees C 
• 266 degrees C

What is the partial pressure of O₂ in air at a total atmospheric pressure of 97.8 kPa? Assume oxygen makes up 21 % of the atmosphere.

• about 15 kilopascals

• about 21 kilopascals

• about 32 kilopascals

• about 63 kilopascals

When collecting a gas over water, the total pressure in the column is equal to the pressure of the collected gas ___

• plus atmospheric pressure

• minus atmospheric pressure

• plus the vapor pressure of the water

• minus the vapor pressure of the water

A 15.50 gram sample of a gas exerts a pressure of 1.40 atmospheres when held in an 8.00 liter at 22 °C. What is the molar mass (grams/mol) of the gas?

• 33.5 g/mol
• 0.0298 g/mol
• 6.57 g/mol
• 62.2 g/mol

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium with excfess water according to the following reaction?
1Mg + 2H₂O --> Mg(OH)₂ + H₂

• 62L
• 65L
• 31L
• 124L

Find the density (in g / L) of oxygen at 120 kPa and 30°C

• .0477 g/L

• 1.53 g/L

• 20.9 g/L

• 32 g/L