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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. McCord’s 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