Heat of fusion (? H fus ) is used for calculations involving a phase change betw

Question

Heat of fusion (?Hfus ) is used for calculations involving a phase change between solid and liquid, with no temperature change. For H2O , ?Hfus=6.02 kJ/mol .

Specific heat capacity (C ) is used for calculations that involve a temperature change, but no phase change. For liquid water, C=4.184 J/(g??C) .

Heat of vaporization (?Hvap ) is used for calculations involving a phase change between liquid and gas, with no temperature change. For H2O , ?Hvap=40.7 kJ/mol .

How much heat is required to melt 26.0 g of ice at its melting point?

Express your answer numerically in kilojoules.

Explanation / Answer

mass of ice = 26.0g, moles = 26/18 = 1.44 moles

latent heat of fusion of ice = ?Hfus=6.02 kJ/mol

heat required = mass x latent heat of fusion

heat required = 1.44 mole x 6.02 kJ/mol

heat required = 8.67 kJ

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