Using heat capacity to determine molar entropy

Boltzmann Equation for Entropy: $S = k_{B} \ln W$

Jessa Maheras 4F
Posts: 121
Joined: Fri Aug 02, 2019 12:16 am

Using heat capacity to determine molar entropy

The textbook says that you can use heat capacity data to determine the standard molar entropy of a substance and discusses this in 4H.1, but I don't understand how this is done. Can someone explain how or the connection between heat capacity and molar entropy?

Sarah Zhari 1D
Posts: 103
Joined: Sat Sep 14, 2019 12:16 am

Re: Using heat capacity to determine molar entropy

I think that the heat capacity is used in the equation $\Delta S=\frac{q}{t}$, where the heat capacity is used to calculate the value of q using the equation $q=mc\Delta T$

Jessa Maheras 4F
Posts: 121
Joined: Fri Aug 02, 2019 12:16 am

Re: Using heat capacity to determine molar entropy

Sarah Zhari 1D wrote:I think that the heat capacity is used in the equation $\Delta S=\frac{q}{t}$, where the heat capacity is used to calculate the value of q using the equation $q=mc\Delta T$

Yes that makes lots of sense thank you! From what I understand now, C=q/mdeltaT , and you can solve for q and use that to find molar entropy? Do you know what about this would make it be at standard molar entropy? (standard in specific?)

Morgan Carrington 2H
Posts: 54
Joined: Wed Nov 14, 2018 12:22 am

Re: Using heat capacity to determine molar entropy

Jessa Maheras 4F wrote:
Sarah Zhari 1D wrote:I think that the heat capacity is used in the equation $\Delta S=\frac{q}{t}$, where the heat capacity is used to calculate the value of q using the equation $q=mc\Delta T$

Yes that makes lots of sense thank you! From what I understand now, C=q/mdeltaT , and you can solve for q and use that to find molar entropy? Do you know what about this would make it be at standard molar entropy? (standard in specific?)

I believe that since the q values would have to be held at standard pressure (and/or temperature) in order for the change in entropy to be in standard conditions.

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