Question

define latent heat of vapour
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Answer 1

latent heat of vaporization refers to the heat energy used to change the state of a substance from liquid to vapour

Answer 2

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Latent heat of vaporization is a physical property of a substance. It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. ... The heat of vaporization of water is about 2,260 kJ/kg, which is equal to 40.8 kJ/mol.