### equations

Posted:

**Sat Jan 27, 2018 3:59 pm**Which equation do we use for change in volume? Change in temperature? And change in pressure?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=133&t=26421

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Posted: **Sat Jan 27, 2018 3:59 pm**

Which equation do we use for change in volume? Change in temperature? And change in pressure?

Posted: **Sat Jan 27, 2018 4:42 pm**

For a change in volume, you would use deltaS=nRln(V2/V1), in which n=moles of gas, R=ideal gas constant, V2=the final volume, and V1=the initial volume.

For a change in temperature, you would use deltaS=nCln(T2/T1), in which n=moles of gas, C=molar heat capacity, T2=final temperature, and T1=the initial temperature.

For a change in pressure, the formula is almost the same as the change in volume formula, but V1 and V2 are replaced by P2 and P1 respectively (pressure is inversely related to volume).

For a change in temperature, you would use deltaS=nCln(T2/T1), in which n=moles of gas, C=molar heat capacity, T2=final temperature, and T1=the initial temperature.

For a change in pressure, the formula is almost the same as the change in volume formula, but V1 and V2 are replaced by P2 and P1 respectively (pressure is inversely related to volume).