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Unformatted text preview: delgado moreno (mpd565) – H13: Electrochem 2 – mccord – (51625) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The reaction 2 Ag + (aq) + Fe(s) → Fe 2+ (aq) + 2 Ag(s) taking place in a battery generates a current of 2 amp. How much Fe(s) is consumed in 1 hour? 1. 2.08 g 2. 1.04 g 3. 4.16 g 4. 8.32 g 5. 3.46 g 002 10.0 points What mass of copper would be produced by the reduction of copper(II) ions during pas- sage of 1 ampere of current through a solution of copper(II) sulfate for 63 minutes? Answer in units of g. 003 10.0 points How long will it take to deposit 0.00235 moles of gold by the electrolysis of KAuCl 4 (aq) us- ing a current of 0.214 amperes? 1. 53.0 min 2. 17.7 min 3. 106 min 4. 70.7 min 5. 26.5 min 004 (part 1 of 2) 10.0 points Thomas Edison was faced with the problem of measuring the electricity that each of his customers had used. His first solution was to use a zinc “coulometer”, an electrolytic cell in which the quantity of electricity is de- termined by measuring the mass of zinc de- posited. Only some of the current used by the customer passed through the coulome- ter. What mass of zinc would be deposited in 38 days if 1 mA of current passed through the cell continuously? Answer in units of g. 005 (part 2 of 2) 10.0 points An alternative solution to this problem is to collect the hydrogen produced by electrolysis and measure its volume. What volume would be collected at 296 K and 1 . 24 bar under the same conditions?same conditions?...
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