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Heat Capacity when cooling

Posted: Thu Feb 08, 2018 7:45 pm
by YashDeshmukh1D
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?

Re: Heat Capacity when cooling

Posted: Thu Feb 08, 2018 7:57 pm
by David Minasyan 1C
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.