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The enthalpy of evaporation of water at ...

The enthalpy of evaporation of water at 373 K is `40.67 kJ mol^(-1)`. What will be the enthalpy of evaporation at 353 K and 393 K if average molar heats at constant pressure in this range for water in liquid and vapour states are 75.312 and `33.89 JK^(-1) mol^(-1)` respectively?

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The correct Answer is:
`-475.0 kJ mol^(-1)`
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