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## Homework Statement

http://img846.imageshack.us/img846/5678/problemem.jpg [Broken]

## Homework Equations

Pv= nRT

U = Q-W

dS = dQ/T (entropy transferred) + σ (entropy created)

## The Attempt at a Solution

**Assuming that as the gas expands Volume increases and Pressure decreases, thus the Temperature will stay constant.**

__Part A.__

**Entropy will increase as the gas expands. Assuming the system is isolated, there will be no entropy transfered in or out.**

__Part B.__

**For entropy created**: Because T is constant internal energy U will stay constant, which means that Q = -W = -dPV so dS = -dPV. But the pressure in the problem is not given so I am stuck.

So I was wondering, are my assumptions correct?

- V and P change but T stays the same
- no entropy is transfered because the system is isolated

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