SOLVED

61) A balloon contains 0.76 mol N2, 0.18 mol O2, 0.031 mol He and 0.026 mol H2 at 749 mm Hg. What is the partial pressure of O2? A) 20 mm Hg B) 23 mm Hg C) 140 mm Hg D) 570 mm Hg 62) What is the total pressure in a 6.00-L flask which contains 0.127 mol of H2(g) and 0.288 mol of N2(g) at 20.0°C? A) 0.510 atm B) 0.681 atm C) 1.16 atm D) 1.66 atm 63) The concentration of water vapor in a sample of air that has a partial pressure of water of 0.91 torr and a total pressure of air of 735 torr is ________ ppm. A) 1.2 × B) 1.2 C) 0.12 D) 8.1 × E) 0.81 64) A sample of air from a home is found to contain 6.2 ppm of carbon monoxide. This means that if the total pressure is 695 torr, then the partial pressure of CO is ________ torr. A) 4.3 × B) 4.3 × C) 4.3 D) 8.9 × 103 E) 1.1 × 108 65) The concentration of ozone in a sample of air that has a partial pressure of of 0.33 torr and a total pressure of air of 735 torr is ________ ppm. A) 4.5 × B) 0.45 C) 0.045 D) 2.2 × E) 2.2 66) The mole fraction of carbon dioxide in dry air near sea level is 0.000375, where the molar mass of carbon dioxide is 44.010. The partial pressure of carbon dioxide when the total atmospheric pressure (dry air) is 97.5 kPa is A) 2.63 × 105 B) 5.97 × 103 C) 0.0370 D) 1.63 E) 8.40 × 10-4 67) In the laboratory, hydrogen gas is usually made by the following reaction: Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq) How many liters of H2 gas, collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C, can be made from 3.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C. A) 0.0975 L B) 1.30 L C) 1.33 L D) 1.36 L 68) A 0.600 g sample containing Ag2O and inert material is heated, causing the silver oxide to decompose according to the following equation: 2 Ag2O(s) → 4 Ag(s) + O2(g) If 13.8 mL of gas are collected over water at 27°C and 1.00 atm external pressure, what is the percentage of silver oxide in the sample? The partial pressure of water is 26.7 mm Hg at 27°C. A) 10.4% B) 20.9% C) 41.8% D) 44.8% 69) Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn(s) + (aq) → Zn(aq) + (g) In an experiment, 225 mL of wet is collected over water at 27°C and a barometric pressure of How many grams of Zn have been consumed? The vapor pressure of water at 27°C is A) 4.79 × B) 0.567 C) 567 D) 431 E) 4.31 × 70) Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn(s) + (aq) → Zn(aq) + (g) In an experiment, 201 mL of wet is collected over water at 27°C and a barometric pressure of The vapor pressure of water at 27°C is 26.74 torr. The partial pressure of hydrogen in this experiment is ________ atm. A) 0.929 B) 706 C) 0.964 D) 760 E) 1.00