Question

9. The density of a gas is 2.2 g/L at 29°C and 0.966 bar. What is its molar mass? (1 atm = 1.01325 bar) 10. Nitrox is a gas mixture used in scuba diving that contains a higher-than-normal level of oxygen and a lower-thannormal level of nitrogen. A lower amount of nitrogen reduces the risk of “the bends.” a. What percent of nitrogen and oxygen is present in the given nitrox tank? b. What is the partial pressure of each gas (in psi) in the tank? 11. Which species in each pair has stronger intermolecular forces? a. CO2 or H2O b. CO2 or HBr c. HBr or H2O d. He or Ne 3 12. Calculate the partial pressure of oxygen (in atm) in a sample collected over water, given that the total pressure of the mixture is 0.98 atm and the partial pressure of water vapor is 16.5 mm Hg. 13. Hydrogen peroxide solution, H2O2 (aq), spontaneously decomposes into liquid water and gaseous oxygen. What volume of oxygen, measured at 27°C and 733 torr, is produced from the decomposition of 5.00 x 102 grams of a 3.0% by mass H2O2 solution? 14. The appearance of the atmosphere of Jupiter has long fascinated astronomers and many hobbyists because of its Giant Red Spot and colorful cloud layer. The atmospheric pressure builds up from its outer boundary toward the surface. At 1 bar pressure, the temperature is −108°C, and the density of the atmospheric gas mixture is 0.16 kg/m3. What is the average molar mass of the mixture? The atmosphere is mostly composed of hydrogen and helium. Use the average molar mass to find the percentage of each of the two major components of the Jovian atmosphere.

Answer 1