## Calculating Delta S with a change in temperature

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

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Tinisha 1G
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

### Calculating Delta S with a change in temperature

If the problem does not specify, do you use C(@constant pressure) or C(@constant volume) when calculating delta S with a temperature change?

Rachana Jayaraman 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

### Re: Calculating Delta S with a change in temperature

Usually it is constant pressure, unless it's a two step question where you are changing volume and temperature. In the second case, you do constant volume because you do not want it to change again.

Brian Chhoy 4I
Posts: 66
Joined: Fri Sep 28, 2018 12:16 am

### Re: Calculating Delta S with a change in temperature

Also take into account the shape of the molecule because whether it is monatomic, linear, or non-linear changes the C value in both constant pressure and volume.

Ray Huang 1G
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

### Re: Calculating Delta S with a change in temperature

Check the reaction to see if more molecules are produced on the product side vs reactant side. Then check if it's in a container or not. Assuming Cp is usually safer.

Jason Ye 2I
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

### Re: Calculating Delta S with a change in temperature

You can change the variables to include temperature its just that temperature is inverse.

Ashe Chen 2C
Posts: 31
Joined: Mon Jan 07, 2019 8:23 am

### Re: Calculating Delta S with a change in temperature

It is usually Cp unless the volume is changing

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