If the vapor pressure of water in an open system at 25 °C is 23.8 mmHg,what is Δ_rG for the reaction below at 25 °C? H₂O(l)→ H₂O(g,23.8 mmHg) A)0 kJ/mol B)-8.58 kJ/mol C)+8.58 kJ/mol D)-0.720 kJ/mol E)+0.720 kJ/mol

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The correct answer is A because the vapor pressure of water in an open system at 25 °C is 23.8 mmHg, which is equal to the equilibrium vapor pressure of water at 25 °C. Therefore, the change in free energy for the reaction is zero.

If the Vapor Pressure of Water in an Open System