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 Form 4 Chemistry: Energy changes in chemical and physical processes lessons

Meaning of Molar heat of fusion, ΔHf and Molar heat of vaporization, ΔHvap

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Answer Text:
Molar heat of fusion, ΔHf;
- Is the amount of heat required to change one mole of a solid into a liquid at its melting point.
- It is a measure of intermolecular forces between solid particles since it is the heat energy used to separate the solid particles.
Molar heat of vaporization, ΔHvap;
- Is the amount of heat required to change one mole of liquid into vapor at its boiling point.
- It is a measure of the intermolecular forces between the liquid particles since it is the heat energy used to separate liquid particles.