Question

the amount of heat needed to boil a liquid at its boiling point is called the
heat of fusion
heat of vaporization
heat of boiling
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Explanation:

Heat of fusion refers to the heat needed to melt a solid at its melting point. Heat of vaporization is the specific term for the heat required to convert a liquid to gas at its boiling point. "Heat of boiling" is not a standard scientific term for this concept.

Answer:

Heat of Vaporization