heat cap for liquid water instead of solid water

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CNourian2H
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

heat cap for liquid water instead of solid water

Postby CNourian2H » Sun Feb 09, 2020 10:07 pm

Why do you use the specific heat capacity for liquid water instead of solid water in this problem?
4C.11 How much heat is needed to convert 80.0 g of ice at 0.0 8C into liquid water at 20.0 8C (see Tables 4A.2 and 4C.1)?

ASetlur_1G
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: heat cap for liquid water instead of solid water

Postby ASetlur_1G » Sun Feb 09, 2020 10:15 pm

You first have to calculate the heat for a phase change (ice to liquid water), which is done by multiplying the enthalpy of fusion and the number of moles. Then, you use q = mc delta t, by which time the ice has already changed into liquid water, so you use the specific heat capacity of liquid water.


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