 # Question & Answer: Constants The following values may be useful when solving this tutorial. Part A In the activity,….. Constants The following values may be useful when solving this tutorial. Part A In the activity, click on the E degree _cell and K_eq quantities to observe how they are related. Use this relation to calculate K_eq for the following redox reaction that occurs in an electrochemical cell having two electrodes: a cathode and an anode. The two half-reactions that occur in the cell are Cu^2+ (aq) + 2e^- rightarrow Cu(s) and Zn(s) rightarrow Zn^2+ (aq) + 2e^- The net reaction is Cu^2+ (aq) + Zn(s) rightarrow Cu(s) + Zn^2+ (aq) Use the given standard reduction potentials in your calculation as appropriate. Express your answer numerically to three significant figures.

First, relate Eºcell

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dG = -RT*ln(Keq)

dG = -n*F*Eºcell

therefore

n*F*Eºcell = RT*ln(Keq)

substitute data

Eºcell = Ered – Eox = 0.337 – – 0.763 = 1.1 V

n*F*Eºcell = RT*ln(Keq)

2*96500*1.1 = 8.314*298*ln(Keq)

lnKeq = 2*96500*1.1/(8.314*298)

Keq = exp(85.6887)

Keq = 1.6373*10^37

Keq = 1.64*10^37 (to 3 sig. fig)