Module 3: Gas Laws

At 0°C and 100 kPa, 100 mL of oxygen gas is how many moles?

• 0.00881 mol

• 0.00440 mol

• 0.00220 mol

• 0.00110 mol

Carbon dioxide gas at 0°C has a volume of 150 L. What mass does this gas have?

• 121 g

• 291 g

• 342 g

• 491 g

What volume of gas is produced when 10.0 g of copper is reacted with excess nitric acid at 25°C and 100 kPa?

(All products and reactants are in a 1:1 mole ratio)

• 3.89 L

• 4.20 L

• 7.78 L

• 15.60 L

Ammonia gas has a volume of 2.4 L at 25°C at 100 kPa. What volume would ammonia gas have at a pressure of 250 kPa?

• 940 mL

• 950 mL

• 960 mL

• 970 mL

–16°C in terms of kelvins is which of the following?

• 305 K

• 289 K

• 273 K

• 257 K

A sample of nitrogen gas has a volume of 24 L at a temperature of 34°C. What volume should it occupy if it is cooled to 0°C?

• 19 L

• 21 L

• 23 L

• 25 L

1.3 × 10^–3 mol of nitrogen gas at a pressure of 100 kPa occupies 32 mL in a syringe at 25°C. If more nitrogen gas is added to the syringe at the same temperature and pressure such that the volume occupied was 50 mL, how many moles extra was added into the syringe?

• 1.3 × 10^–4 mol

• 2.0 × 10^–4 mol

• 7.0 × 10^–4 mol

• 2.0 × 10^–3 mol

What mass of methane gas (CH₄) occupies a volume of 20 L at 10°C and pressure of 250 kPa?

• 33 g

• 34 g

• 35 g

• 36 g

50 mL of a sodium carbonate solution is reacted with excess hydrochloric acid to produce sodium chloride, water and 120 mL of carbon dioxide gas at 35°C at 150 kPa. What is the molarity of the sodium carbonate solution?

• 0.14 mol/L

• 0.16 mol/L

• 0.18 mol/L

• 0.20 mol/L

If 4.86 g of an unknown gas occupies a 25 L container at 45°C produces a pressure of 50 kPa, what is the molar mass of this gas?

• 5.31 g/mol

• 10.3 g/mol

• 14.5 g/mol

• 26.7 g/mol