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Unformatted text preview: zheng (lz3323) – H10: Gases 2 – mccord – (50970) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points What is the mass of oxygen gas in a 17.9 L container at 27.0 ◦ C and 5.58 atm? Answer in units of g. 002 10.0 points Toluene (C 6 H 5 CH 3 ) is a liquid compound similar to benzene (C 6 H 6 ). Calculate the mole fraction of toluene in the solution that contains 54.3 g toluene and 54.0 g benzene. 003 (part 1 of 4) 10.0 points Iron pyrite (FeS 2 ) is the form in which much of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a substantial contributor to acid rain. What mass of Fe 2 O 3 is produced from the reaction is 78 L of oxygen at 3 . 96 atm and 167 ◦ C with an excess of iron pyrite? Answer in units of g. 004 (part 2 of 4) 10.0 points If the sulfur dioxide that is generated above is dissolved to form 4 . 4 L of aqueous solu- tion, what is the molar concentration of the resulting sulfurous acid (H 2 SO 3 ) solution? Answer in units of M. 005 (part 3 of 4) 10.0 points What mass of SO 2 is produced in the burning of 1 tonne (1 t = 1000 kg) of high-sulfur coal, if the coal is 4% pyrite by mass? Answer in units of kg. 006 (part 4 of 4) 10.0 points From the previous problem, what is the vol- ume of the SO 2 gas at 1 . 9 atm and 38 ◦ C?...
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- Spring '07