Constants Heat of fusion (? H fus) is used for calculations involving a phase ch
ID: 1387192 • Letter: C
Question
Constants
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.
Part A
How much heat is required to melt 92.0g of ice at its melting point?
Express your answer numerically in kilojoules.
Explanation / Answer
molecular weight of water=18
no of moles=weight/molecular weight
=92/18
=5.11moles
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.
=6.02*5.11
=30.76KJ