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For the cell reaction AgCl(s) + 1/2 H2(g) -> Ag(s) + H+ + Cl-, the standard Gibbs free energy change is -21.52 kJ. What is the standard Gibbs free energy change for the reaction 2AgCl(s) + H2(g) -> 2Ag(s) + 2H+ + 2Cl-?

1. -21.52 kJ
2. -10.76 kJ
3. -43.04 kJ
4. 43.04 kJ

Correct answer: -43.04 kJ

Solution

ΔG° is an extensive thermodynamic quantity. When you multiply the balanced equation by a factor, ΔG° is multiplied by the same factor. The second equation is the first multiplied by 2, so ΔG° doubles.

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