Problem: Find w for the change in state of 1.0 mol H2O(l) at 81 oC to H2O(g) at 115 oC. The heat capacity of H2O(l) = 75.3 J/mol K, heat capacity of H2O(g) = 25.0 J/mol K, and the heat of vaporization of H2O is 40.7 103/mol at 100 oC.

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We are asked to calculate w for the change in state of 1.0 mol H2O(l) at 81 oC to H2O(g) at 115 oC.


Assume that the change in volume will be the volume of the gas since the volume of the liquid is negligible compared to the gas volume. 


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Problem Details

Find w for the change in state of 1.0 mol H2O(l) at 81 oC to H2O(g) at 115 oC. The heat capacity of H2O(l) = 75.3 J/mol K, heat capacity of H2O(g) = 25.0 J/mol K, and the heat of vaporization of H2O is 40.7 103/mol at 100 oC.

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