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## Homework Statement

two vessles contain the same number N of molecules of the same perfect gas. initially the two vessles are isolated from each other, being at the same temp T but at different P.

now partition is removed. find the change in entropy of the system when equilibrium is re-established in terms of initial pressures P1 and P2. show the change is non-negative.

## The Attempt at a Solution

i assume V and P are not constant? only T is?

so ∆S = ∫C dT /T

so since T is constant, i assume ∆S = 0 ??? regardless of p and V?

thanks