## HW 5-6: Question 8

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

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Shaniya Kerns 4D
Posts: 73
Joined: Fri Sep 29, 2023 11:39 am

### HW 5-6: Question 8

Calculate the standard molar entropy of vaporization of water at 56.0 °C, given that its standard molar entropy of vaporization at 100.0 °C is 109.0 J•K-l•moll and the molar heat capacities at constant pressure for liquid water and water vapor are 75.3 J-K-' mol-' and 33.6 J-K-'.mol', respectively, in this temperature range.

After finding the molar entropy of each pressure which equation do I use to find the standard molar entropy of vap and how would I know where each answer goes in the equation?

Mackenzie Lay 2H
Posts: 42
Joined: Wed Feb 15, 2023 8:17 am
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### Re: HW 5-6: Question 8

Hi! I found the answer to be 117.256. The formula I would use is deltaS = CP,m ln (T2/T1), 109.0 J*K^-1*mol^-1, anddeltaS = CP,m ln(T2/T1).

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