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Gurvardaan Bal1L wrote:For problem 9.13, why is R used instead of heat capacity for the entropy equation regarding temperature change?
Heat capacity by definition is the amount of energy required to raise the temperature of a certain amount of substance by 1 kelvin. In the problem however, you're not raising or lowering the temperature because it is at a constant 85 degrees C. Therefore, you have no use for the formula delta S = n*C* ln(T2/T1), which is what I'm guessing you were thinking of.
Instead, use delta S=n*R*ln(V2/V1). You can see how they derived this equation on page 323.
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