The standard cell potential for the reaction shown below forming a metal oxide i

Question

The standard cell potential for the reaction shown below forming a metal oxide is E degree cell = 1.32 V. 4M(s) + O2(g) rightarrow 2M2O(s) What is the cell potential (Ecell) at 25 degree C if the pressure of oxygen gas is 2.06 times 10-3 atm? 1.36 V 1.32 V 1.28 V 1.16 V Given these three half-reactions, which electrochemical cell would produce the largest standard cell potential? Cu2+(aq) + Ni(s) rightarrow Cu(s) + Ni2+(aq) Cu2+(aq) + Fe(s) rightarrow Cu(s) + Fe2+(aq) Cu+(s) + Ni(s) rightarrow Cu2+(aq) + Ni2+(aq) Fe(s) + Ni2+(aq) rightarrow Fe2+(aq) + Ni2(s) What is the cathode reaction for the spontaneous process associated with the voltaic cell?

Explanation / Answer

65). E = 1.32- (0.0592/2) log10(1/(2.06*10-3)) = 13.6

66). E = E(cathode) - E(anode) ;

Hence it will be maximum when cu becomes cathode and fe becomes anode.

Hence B is the correct answer

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