Adv Chem Unit 09 Mock Exam

At standard temperature, a gas has a volume of 332 mL. The temperature is then increased to 128°C, and the pressure is held constant. What is the new volume?

• Unable to determine without initial temperature. 

• 488mL

• 226mL

• 708mL

A gas has a pressure of 2.26 atm and occupies a volume of 4.40 L. If the gas is compressed to a volume of 2.68 L, what will its pressure be, assuming constant temperature? 

• 3.71atm

• 5.22atm

• 1.38atm 

• 2.68atm

Find the volume of ammonia, NH₃, produced from a reaction of 4.00 moles of nitrogen gas at STP with excess hydrogen gas.

N₂(g) + 3H₂(g) → 2NH₃(g)

• 8.00L

• 179L

• 22.4L

• 44.8L

If the pressure of a sample of a gas is decreased to 1/4 the original pressure while the temperature is held constant, what happens to the volume of the gas?

• It increases 4 times the original volume.

• It decreases to 1/4 the original volume.

• It stays the same.

• There is not enough information.

A 2.5 mole sample of hydrogen gas, H₂(g), at 1.5 atm occupies 56.0 liters. What is the temperature of the sample?

• 409K

• 409°C

• 682K

• 682°C

For the reaction

2 HCl(g) + Na₂CO₃(s) → 2 NaCl(s) + H₂O(l) + CO₂(g) 

179.2 liters of CO₂ is collected at 1.500atm and 94.00°C. How many grams of NaCl are also formed?

Molar Mass of CO₂ = 44g/mol

Molar Mass of NaCl = 58g/mol

• 1035g

• 517.6g

• 179.2g

• 358.4g

A gas has a volume of 12.0 L at a pressure of 2.00 atm. What volume is needed to change the pressure to 3.00 L at constant temperature?

• 12.0atm

• 1.00atm

• 0.500atm

• 8.00atm

A vessel at 987 mmHg contains nitrogen, argon, helium, and carbon dioxide gases. The partial pressure of the first three gases are 44.0 mmHg, 466 mmHg, and 220 mmHg respectively.  What is the partial pressure of carbon dioxide in atm?

• 1.30 atm

• 0.338 atm

• 2.00 atm

• 0.961 atm

Consider the mixture of gases pictured.  Helium has the _________ VELOCITY as neon because it has _____________.

• SAME:THE SAME TEMPERATURE

• HIGHER:THE LOWER MOLAR MASS

• SAME:THE SAME PRESSURE

• LOWER:THE HIGHER MOLAR MASS

How much H₂ gas at STP can be produced by the reaction

2 Na(s) + 2 H₂O(ℓ) → H₂(g) + 2 NaOH(aq)

of 2.70 g of Na and excess water? Answer in units of L

• 1.32L

• 2.64L

• 1.35L

• 5.40L