Calculating Delta S with a change in temperature

Volume:
Temperature:

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

Calculating Delta S with a change in temperature

Postby Tinisha 1G » Wed Feb 13, 2019 12:39 pm

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

Postby Rachana Jayaraman 1H » Wed Feb 13, 2019 1:01 pm

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

Postby Brian Chhoy 4I » Fri Feb 15, 2019 2:26 am

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

Postby Ray Huang 1G » Fri Feb 15, 2019 8:50 am

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

Postby Jason Ye 2I » Fri Feb 15, 2019 2:05 pm

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

Postby Ashe Chen 2C » Sat Feb 16, 2019 9:38 pm

It is usually Cp unless the volume is changing


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