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Change in Entropy due to Change in Pressure?

Posted: Mon Feb 10, 2020 6:41 pm
by Brian_Ho_2B
Are we expected to include the change in entropy due to change in pressure when we are adding up the entropies to find the total change in entropy? I was doing some practice problems and there was a change in volume, temperature, and pressure (I found that out by using PV = nRT and saw that the values for P were different). I calculated the delta S for all of those three parameters and added them up, but the answer wanted me only to add up the delta S (of volume) and the delta S (of temperature). I'm confused as to whether or not I should include the delta S due to delta P in my calculation, because there was indeed a change in pressure.

Re: Change in Entropy due to Change in Pressure?

Posted: Tue Feb 11, 2020 10:35 am
by Sue Bin Park 2I
was wondering this too. also, how did you find entropy from change in pressure exactly?

Re: Change in Entropy due to Change in Pressure?

Posted: Tue Feb 11, 2020 10:38 am
by Sue Bin Park 2I
oh wait...did you use the ∆S = nR ln(V2/V1) but replace volume ratio with (P1/P2)?