A galvanic cell is constructed in which an Ag+/Ag half cell is connected to a Ni2+/Ni half cell. Calculate delta G standard for this reaction at 25 degrees celsius: 2Ag+ (aq) + Ni (s) ---> 2Ag(s) + Ni2+(aq)

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Answer 1 · 2014-06-23T22:25:42

#ΔG°# = -203 kJ

Calculate #E_"cell"^°#.

2 × [Ag⁺(aq) + e⁻ → Ag(s); #E°# = + 0.7996 V
Ni(s) → Ni²⁺ + 2e⁻; #E°# = + 0.25 V
2Ag⁺(aq) + Ni(s) → 2Ag(s) + Ni²⁺(aq); #E_"cell"^°# = 1.05 V.

Calculate ΔG°

#ΔG° = -nFE_"cell"^°# = -2 mol × 96 485 C·mol⁻¹ × 1.05 J·C⁻¹ = -2.03 × 10⁵ J = -203 kJ

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