16. The evaporation of liquid water at room temperature (25 °C) and \"ordinary\"

Question

16. The evaporation of liquid water at room temperature (25 °C) and "ordinary" conditions is spontaneous despite the fact that the standard free energy change (AG°) for HyOH0(8) is positive. The reason this evaporation at 25 °C occurs is because: endother mlC a. water is most stable in the gaseous state b. the decrease in entropy of the water promotes the reaction. the partial pressure of water in ordinary air is below the equilibrium valu. d. the phase change is endothermic. e ordinary water vapor acts as a "common ion" for the reaction

Explanation / Answer

formation of H2O as a liquid is an exothermic reaction that releases heat as it proceeds. The formation of H2O aa a gas from either liquid or solid state is an endothermic reaction beacause it reqiures heat to proceed the reaction so it has to be endothermic only.

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