SOLVED

41) The rate of effusion of oxygen to an unknown gas is 0.935. What is the other gas? A) Ne B) Ar C) F2 D) N2 42) Determine the volume of H2S (at 375 K and 1.20 atm) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 2 H2S(g) + SO2(g) → 3 S(s) + 2 H2O(g) A) 44.0 L B) 29.3 L C) 22.7 L D) 34.1 L E) 66.0 L 43) How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.60 atm) according to the following reaction? Assume that there is excess Xe. Xe(g) + 3 F2(g) → XeF6(g) A) 1.21 × 1023 molecules XeF6 B) 8.25 × 1023 molecules XeF6 C) 2.75 × 1023 molecules XeF6 D) 7.29 × 1023 molecules XeF6 E) 1.37 × 1023 molecules XeF6 44) Determine the theoretical yield and the percent yield if 21.8 g of K2CO3 is produced from reacting 27.9 g KO2 with 29.0 L of CO2 (at STP). The molar mass of KO2 = 71.10 g/mol and K2CO3 = 138.21 g/mol. 4 KO2(s) + 2 CO2(g) → 2 K2CO3(s) + 3 O2(g) A) 27.1 g, 80.4 % yield B) 179 g, 12.2 % yield C) 91.7 g, 23.8 % yield D) 206 g, 10.6 % yield E) 61.0 g, 35.7 % yield 45) Determine the volume of SO2 (at STP) formed from the reaction of 96.7 g of FeS2 and 55.0 L of O2 (at 398 K and 1.20 atm). The molar mass of FeS2 is 119.99 g/mol. 4 FeS2(s) + 11 O2(g) → 2 Fe2O3(s) + 8 SO2(g) A) 36.1 L B) 45.3 L C) 18.1 L D) 27.6 L E) 32.9 L 46) Determine the mass of water formed when 12.5 L NH3 (at 298 K and 1.50 atm) is reacted with 18.9 L of O2 (at 323 K and 1.1 atm). 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) A) 17.0 g H2O B) 20.7 g H2O C) 37.7 g H2O D) 13.8 g H2O E) 27.9 g H2O 47) Determine the total volume of all gases (at STP) formed when 50.0 mL of TNT (C3H5(NO3)3, d = 1.60 g/mL, molar mass = 227.10 g/mol) reacts according to the following reaction. 4 C3H5(NO3)3(l) → 6 N2(g) + O2(g) + 12 CO2(g) + 10 H2O(g) A) 4.93 L B) 57.2 L C) 29.6 L D) 448 L E) 175 L 48) This equation is used to calculate the properties of a gas under nonideal conditions. A) Charles’s Law B) Avogadro’s Law C) Boyle’s Law D) van der Waals equation E) Dalton’s Law 49) Which of the following statements is true? A) Particles of different masses have the same average speed at a given temperature. B) The larger a molecule, the faster it will effuse. C) At very high pressures, a gas will occupy a larger volume than predicted by the ideal gas law. D) For a given gas, the lower the temperature, the faster it will effuse. E) None of the above statements are true. 50) Which of the following statements is true? A) At a given temperature, lighter gas particles travel more slowly than heavier gas particles. B) The smaller a gas particle, the slower it will effuse. C) The higher the temperature, the lower the average kinetic energy of the sample. D) At low temperatures, intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law. E