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3. In a common car battery, six identical cells each carry out the following reaction: Pb + PbO2 + 2HSO4 - + 2H 2PbSO4 + 2H2O For such a cell, E° is 2.04 V. Calculate AG at 25°C. A) -787 kJ B) -197 kJ C) -394 kJ D) -98 kJ E) -0.121 kJ 4. Gold (atomic mass = 197 g/mol) is plated from a solution of chlorauric acid, HAuCl4; it deposits on the cathode. Calculate the time it takes to deposit 0.55 g of gold, passing a current of 0.12 amperes. A) 0.0018 days B) 0.62 h C) 1.9 h D) 2.5 h E) 1.2 h 5. A concentration cell is constructed using two Cu electrodes with Cu2+ concentrations of 2.4 X 10-3 M and 3.0 M in the two half-cells. The standard reduction potential of Cu2 2+ is +0.34 V. Calculate the potential of the cell at 25°C. A) 0.25 V B) 0.092 V C) -0.092 V D) -0.43 V E) 0.43 V 6. What condition is true for the following equation: AG = AG° + RT InK A) K=1 B) AG° = 0 C) AG=AG D) AG =0 E) All of the above.

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