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Unformatted text preview: sakerwalla (hs9229) H03: Mixtures and KMT mccord (50960) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. All students from Dr. McCords MWF 11am class (50960) must report to the correct room for the exams. There are 2 different rooms and the class is split according to the first letter of your last name. Go to the right room or you WILL receive a zero on the exams. A-L go to UTC 2.112A M-Z go to UTC 2.102A 001 (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 71 L of oxygen at 3 . 47 atm and 151 C with an excess of iron pyrite? Answer in units of g 002 (part 2 of 4) 10.0 points If the sulfur dioxide that is generated above is dissolved to form 3 . 9 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 003 (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 5% pyrite by mass? Answer in units of kg 004 (part 4 of 4) 10.0 points From the previous problem, what is the vol- ume of the SO 2 gas at 1 . 1 atm and 25 C? Answer in units of L 005 10.0 points Two gases are contained in gas bulbs con- nected by a valve. Gas A is present in a 1 liter bulb at a pressure of 863 torr. Gas B ex- erts a pressure of 375 torr in a 1 liter bulb....
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- Spring '11