Heat Capacity when cooling

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YashDeshmukh1D
Posts: 42
Joined: Fri Sep 29, 2017 7:05 am

Heat Capacity when cooling

Postby YashDeshmukh1D » Thu Feb 08, 2018 7:45 pm

In Example 9.6 in the textbook, it uses the given heat capacity when measuring the entropy change from heating the liquid. However, when calculating entropy change for cooling the vapor back down, it uses Cp,m, which multiplies the given heat capacity by 4. When do you use each one?

David Minasyan 1C
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

Re: Heat Capacity when cooling

Postby David Minasyan 1C » Thu Feb 08, 2018 7:57 pm

I'm pretty sure you're just supposed to use the C value that corresponds to the phase of the reactant. So if it's a liquid, use the regular C value at 4.184, or if its solid then use that one and the same with vapor.


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