General Chemistry II, Summer 2018 urse Home Galvanic Cells, Cell Voltage, and th

Question

General Chemistry II, Summer 2018 urse Home Galvanic Cells, Cell Voltage, and the Nernst Eqn roblem 20.54 Constants Periodic Table ?PartA If the equilibrium constant for a one-electron redox reaction at 298 K is 5.6x10", calculate the corresponding ?0° and Eall Express your answer using two significant figures. x": Xb ? ? ? x x un| x.ion kJ Subrmit Previous Answers Reguest Answer Incorrect; Try Again; 5 attempts remaining Part B Express your answer using two significant figures. SubmitP Previous Answers Request Answer x incorrect; Try Again; 5 attempts remaining Provide Feedback

Explanation / Answer

Part a

Equilibrium constant

K = 5.6*10^4

Gas constant R = 8.314 J/mol·K

Temperature T = 298 K

Standard free energy change

G° = - RT ln K

= - 8.314 J/mol·K x 298 K x ln (5.6*10^4)

= - 2477.572 x 10.933

= - 27087.56 J/mol x 1kJ/1000 J

G° = - 27 kJ

Or

= - 2.7 x 10^1 kJ

Part b

G° = - nFE°cell

-27087.56 J = - 1 mol x 96500 C/mol x E°cell

E°cell = 0.28 V

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