The heat of vaporization of water at the normal boiling

Chapter 9, Problem 9.120

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The heat of vaporization of water at the normal boiling point, 373.2 K, is 40.66 kJ/mol. The specific heat capacity of liquid water is 4.184 J K21 g21 and of gaseous water is 2.02 J K21 g21. Assume that these values are independent of temperature. What is the heat of vaporization of water at 298.2 K? Does this result agree with Appendix 4 data?

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