Delta S equations


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Miriam Sheetz 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:25 am

Delta S equations

Postby Miriam Sheetz 2B » Sat Feb 09, 2019 2:37 pm

Which delta S equations do we have to know for the midterm that are not on the equation sheet?

Posts: 58
Joined: Fri Sep 28, 2018 12:26 am

Re: Delta S equations

Postby harshitasarambale4I » Sun Feb 10, 2019 11:35 am

One of the equations we need to know is...
delta S = -delta H/T

Raquel Ruiz 1K
Posts: 30
Joined: Tue Nov 14, 2017 3:02 am

Re: Delta S equations

Postby Raquel Ruiz 1K » Sun Feb 10, 2019 12:13 pm

delta S(surrounding)= q(surrounding)/T which gives us delta S (surrounding) = -nRln(V2/V1) because q(surr)=w and w= -nRTln(V2/V1)

Albert Duong 4C
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Re: Delta S equations

Postby Albert Duong 4C » Sun Feb 10, 2019 3:28 pm

delta S = nCpln(T2/T1) for constant pressure and delta S = nCvln(T2/T1) for constant volume. For the values of the heat capactities, Cp is (5/2)*R and Cv is (3/2)*R for ideal gas atoms or monatomic gases. Cp=(7/2)*R and Cv=(5/2)*R for diatomic gases such as nitrogen gas (these needed to be known to do some of the homework problems, but I'm not sure if they're going to be on the midterm).

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