Question

Standard reduction potentials

Reduction half-reaction	E∘ (V)
Ag+(aq)+e−→Ag(s)	0.80
Cu2+(aq)+2e−→Cu(s)	0.34
Sn4+(aq)+4e−→Sn(s)	0.15
2H+(aq)+2e−→H2(g)	0
Ni2+(aq)+2e−→Ni(s)	−0.26
Fe2+(aq)+2e−→Fe(s)	−0.45
Zn2+(aq)+2e−→Zn(s)	−0.76
Al3+(aq)+3e−→Al(s)	−1.66
Mg2+(aq)+2e−→Mg(s)	−2.37

Part A

Use the table of standard reduction potentials given above to calculate the equilibrium constant at standard temperature (25 ^∘C) for the following reaction:

 

Express your answer numerically.

Part B

Calculate the standard cell potential (E^∘) for the reaction

 

if K = 3.04×10⁻³.

Express your answer to three significant figures and include the appropriate units.