### 7th edition 4F.9

Posted:

**Wed Feb 06, 2019 11:35 pm**Calculate the change in entropy when the pressure of 1.5mol Ne(g) is decreased isothermally from 15.0 atm to .500 atm. Assume ideal behavior.

Created by Dr. Laurence Lavelle

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

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=131&t=41538

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Posted: **Wed Feb 06, 2019 11:35 pm**

Calculate the change in entropy when the pressure of 1.5mol Ne(g) is decreased isothermally from 15.0 atm to .500 atm. Assume ideal behavior.

Posted: **Thu Feb 07, 2019 10:28 am**

From the equation delta S= nRln(V2/V1), using Boyle's law P1V1=P2V2, derive the equation delta S =nRln(P1/P2), and plug the values in.

1.50mol x 8.314 J/mol/K x ln(15.0atm/0.500atm)=42.4 J/K

1.50mol x 8.314 J/mol/K x ln(15.0atm/0.500atm)=42.4 J/K