# hw 10 - Homework#10 holcombe 1 This print-out should have...

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Unformatted text preview: Homework #10 holcombe 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points The equilibrium constant for the reaction 2 Hg( ) + 2 Cl (aq) + Ni 2+ (aq) Ni(s) + Hg 2 Cl 2 (s) is 5.6 10 20 at 25 C. Calculate the value of E for a cell utilizing this reaction. 1.- 0.25 V 2.- 0.57 V correct 3. + 0.57 V 4.- 1.14 V 5. + 1.14 V Explanation: 002 10.0 points The standard voltage of the cell Ag(s) | AgBr(s) | Br (aq) || Ag + (aq) | Ag(s) is +0.73 V at 25 C. Calculate the equilibrium constant for the cell reaction. 1. 2 . 2 10 12 correct 2. 4 . 6 10 13 3. 2 . 10 15 4. 3 . 9 10 29 5. 5 . 1 10 14 Explanation: 003 10.0 points Calculate the reduction potential for the Zn 2+ | Zn electrode if the Zn 2+ concentra- tion is 1 10 3 M. The standard potential for Zn 2+ + 2 e Zn is- . 7628 V. 1.- . 851 V correct 2.- 1 . 702 V 3.- 1 . 878 V 4.- . 939 V Explanation: [Zn 2+ ] = 1 10 3 M E = E- parenleftbigg . 0592 n parenrightbigg log Q =- . 7628 V- parenleftbigg . 0592 2 parenrightbigg log parenleftbigg 1 1 10 3 parenrightbigg =- . 851 V 004 10.0 points What is the E cell for Mg(s) | Mg 2+ (aq)(0 . 15 M) || Au + (aq)(0 . 3 M) | Au(s)? Assume that the number of electrons trans- ferred in the reaction is n = 2. Mg 2+ + 2 e Mg E red =- 2 . 36 V Au + + e Au E red = +1 . 69 V 1. 4.01 V 2. 4.08 V 3. 4.03 V 4. 4.04 V correct 5. 3 . 2 10 2 V Explanation:...
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hw 10 - Homework#10 holcombe 1 This print-out should have...

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