Unit 12 Review- Gases

What is the temperature of 0.784 moles of a gas at 4,180 mmHg in a 3.2 L flask?

• 207,811 K

• 0.0036 K

• 273 K

• 315 K

A sample of H2 gas at a constant volume has a pressure of 938 mmHg at 70 °C. What is the pressure at 20 °C?

• 801.3 mmHg

• 268 mmHg

• 107 mmHg

• 0.01 mmHg

What pressure will 0.75 mol of Kr exert at 36.2 °C in a 2.87 L vessel?

• 0.15 atm

• 0.78 atm

• 6.63 atm

• 0.037 atm

Given the equation: 2Ag2O --> 4 Ag + O2

How many liters of O2 will be produced if 327.3 grams of Ag2O reacts at a pressure of 745 mmHg and a temperature of 308K

• 0.024 L

• 0.055 L

• 17.86 L

• 18.22 L

If a sample of He occupies 350 mL at 2.45 atm and 283K, what volume will it have at 1.11 atm and 338K?

• 796 mL

• 922.6 mL

• 0.01 mL

• 2.72 mL

If 14.0 g of O2, 12.11 g of CO2, and 4.4 g of He are placed in a 5.00 L flask at 23 °C, what is the total pressure in the flask?

• 12.01 atm

• 10.63 atm

• 8.8 atm

• 30.51 atm

The density of an unknown gas is 2.23 g/L at 25 °C and 0.44 atm. What is the molar mass of the gas?

• 84 g/mol

• 124 g/mol

• 10.4 g/mol

• 4.83 g/mol

What is the mass of 213 L of CO2 at STP?

• 418 g

• 108 g

• 4.84 g

• 0.22 g

Cl2 and Xe are allowed to diffuse into a room. Which gas diffuses faster? How many times faster?

• Cl2: 1.37 times faster

• Xe: 0.73 times faster

• Cl2: 0.73 times faster

• Xe: 1.37 times faster