- #1

Pete_01

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## Homework Statement

At a constant temperature, 0.85 mol of an ideal gas changes its pressure from 350 Torr to 125 Torr. Calculate the entropy change for this expansion process.

## Homework Equations

Ideal gas: PV=nRT

ΔS = nRln(Vf/Vi)

## The Attempt at a Solution

I'm stuck on how to find the volume given the change in pressure, and it being an isothermal process. What am I missing?