Problem

A metal salt with the formula MCl2 crystallizes from water to form a solid with the composition MCl2 # 6 H2O. The equilibrium vapor pressure of water above this solid at 298 K is 18.3 mmHg. What is the value of ΔG for the reaction MCl2 # 6 H2O(s) ∆ MCl2(s) + 6 H2O( g) when the pressure of water vapor is 18.3 mmHg? When the pressure of water vapor is 760 mmHg?

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