CHEM 133 Lesson 7 Quiz Questions and Answers 2026 Update 100% Correct.

9.45 g of liquid hexane (C6H14) is introduced into a 10.0 L vessel containing 13.15 atm of oxygen gas at 21ºC and ignited, yielding carbon dioxide and water. If the vessel is then cooled to –10.ºC, what will be the gas pressure inside the vessel? 3.09 atm 10.9 atm Question 2 (4 points) Saved At constant temperature and volume, a sample of oxygen gas is added to a sample of nitrogen gas. The pressure of the mixture is found by adding the pressures of the two individual gases. This is an example of: Boyle's Law Charles' Law Avogadro's Law Gay-Lussac's Law Question 3 (4 points) Saved A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3. 1/9 12/12/24, 3:29 PM Lesson 7 Quiz 33.8 ft 18.8 mm Question 4 (4 points) Saved For which gas do the molecules have the highest average velocity? Cl2 all gases have the same average velocity CH4 NH3 Question 5 (4 points) Saved If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change? 2 1/4 8 Question 6 (4 points) Saved A sample of a gas occupies 1.40 × 103 mL at 25°C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg? 2/9 12/12/24, 3:29 PM Lesson 7 Quiz 2,100 mL 1,050 mL Question 7 (4 points) Saved You are holding four identical balloons each containing 10.0 g of a different gas. The balloon containing which gas is the largest balloon? Ne H2 O2 Question 8 (4 points) Saved A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The total heat capacity of the calorimeter plus water was 5,760 J/°C. If the temperature rise of the calorimeter with water was 0.570°C, calculate the enthalpy of combustion of magnesium. Mg(s) + 1/2O2(g) → MgO(s) –24.8 kJ/mol –3280 kJ/mol Question 9 (4 points) Saved Which of the following has a ΔH°f = 0 kJ/mol? 3/9 12/12/24, 3:29 PM Lesson 7 Quiz N2(g) NO(g) CS2(l) Fe2+(aq) H2O(l) Question 1 0 (4 points) Saved For most chemical reactions ΔH is much larger than ΔE ΔE is much larger than ΔH ΔH is equal to ΔE Question 1 1 (4 points) Saved Which of the following has a ΔH°f = 0 kJ/mol? CO2(g) Cl-(aq) O3(g) NH3(aq) I2(s) Question 1 2 (4 points) Saved 30.0 mL of pure water at 282 K is mixed with 50.0 mL of pure water at 328 K. What is the final temperature of the mixture? 46 K 397 K