Energy of Phase Changes

AP Chemistry· difficulty 3/5

18.0 g H₂O at 0°C is heated to liquid at 0°C. ΔHfus = 6.01 kJ/mol.

ice -10°C 0°C melt 100°C boil

How much heat is required for the melting step alone?

  • A

    6.01 kJ

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  • B

    108 kJ

  • C

    0.601 kJ

  • D

    60.1 kJ

Explanation

18.0 g / 18.0 g·mol⁻¹ = 1.00 mol; q = (1.00)(6.01 kJ/mol) = 6.01 kJ.

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