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Free energy and vapor pressure

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Consider the thermal decomposition of CaCO3.
CaCO3(s) <--> CaO(s) + CO2(g)

The equilibrium vapor pressures of CO2 are 22.6 mmHg at 700°C and 1829 mmHg at 950°C. Calculate the standard enthalpy of the reaction.
I am having problems finding how to used the standard free energy formula with vapor pressure. Can you help me?

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