Problem: The heat of vaporization of water at 373 K is 40.7 kJ/mol.Find q for the evaporation of 451 g of water at this temperature.

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We’re being asked to determine the heat (q) of the evaporation of 451 g of water at 373 K.


Recall that heat will be absorbed when water is being evaporated (phase change). Calculate heat (q) using the equation:

q=n·Hvap

q = heat, J
n = number of moles (mol)
ΔHvap = heat of vaporization, kJ/mol

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Problem Details

The heat of vaporization of water at 373 K is 40.7 kJ/mol.

Find q for the evaporation of 451 g of water at this temperature.