7. For the reaction, C(graphite) -> C(diamond) at 25°C, AH = 1.897 kJ and AG = 2.90 kJ. Use the Gibbs- Helmholtz equation to demonstrate that C(diamond) is unstable with respect to C(graphite) at any temperature. Hint: AG = 0 right at the temperature at which the above process changes from nonspontaneous to spontaneous.

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