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# Cell Potential and Gibbs Free Energy

CHEM-AJXMHW

Imagine the reaction:

$$2{ { Ag }^{ + } }_{ \left( aq \right) }+{ X }_{ \left( s \right) }\longrightarrow 2{ Ag }_{ \left( s \right) }+{ { X }^{ 2+ } }_{ \left( aq \right) }$$

where $X$ is an unknown substance.

Given the standard Gibbs free energy, $\Delta { G }^{ \circ }=-179.5 \textrm{ kJ}$, for this reaction, identify substance $X$.

A standard reduction potential table is given for reference.