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.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Heat Capacity concept. You can view video lessons to learn Heat Capacity. Or if you need more Heat Capacity practice, you can also practice Heat Capacity practice problems.