?A voltaic cell utilizes the following reaction:\(4 \mathrm{Fe}^{2+}(a

Chapter 20, Problem 20.67

(choose chapter or problem)

A voltaic cell utilizes the following reaction:

\(4 \mathrm{Fe}^{2+}(a q)+\mathrm{O}_{2}(g)+4 \mathrm{H}^{+}(a q) \longrightarrow 4 \mathrm{Fe}^{3+}(a q)+2 \mathrm{H}_{2} \mathrm{O}(l)\)

(a) What is the emf of this cell under standard conditions?

(b) What is the emf of this cell when \(\left[\mathrm{Fe}^{2+}\right]=1.3 \mathrm{M},\left[\mathrm{Fe}^{3+}\right]=\) \(0.010 M, P_{\mathrm{O}_{2}}=0.50 \mathrm{~atm}\), and the pH of the solution in the cathode half-cell is 3.50?

Text Transcription:

4 Fe2+(aq) + O2(g) + 4 H+(aq) longrightarrow 4 Fe3+(aq) + 2 H2O(l)

[Fe2+] = 1.3 M

[Fe3+]= 0.010 M

PO2 = 0.50 atm