### 9.11 P is inverse of V

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**Tue Jan 30, 2018 12:08 am**The question states: Calculate the entropy change when the pressure of 1.50 mol Ne(g) is decreased isothermally from 15.0 atm to .500 atm. Assume ideal behavior.

The solutions manual says the equation for this is deltaS=nRln(P1/P2) instead of P2/P1 because "P is the inverse of V for ideal gases". What does this mean and how did we come to that conclusion?

The solutions manual says the equation for this is deltaS=nRln(P1/P2) instead of P2/P1 because "P is the inverse of V for ideal gases". What does this mean and how did we come to that conclusion?