# Physical chemisty

1. Nov 21, 2011

### NepToon

1. The problem statement, all variables and given/known data
The Clausius-Clapyeron equation ln(p2/p1) = -ΔHvap/R (1/t2 - 1/t1) is derived assuming that ΔHvap is independent of temperature.
Find ΔHvap as a function of temperature for ethanol at constant external pressure.

2. Relevant equations

these are not relevant equations but the equations that i tried solving using-
dU = TdS − pdV

3. The attempt at a solution
i tried starting with the equation for dh and integrating it. i also tried to derive using the clapyeron equation dp=(ΔH/tΔv) dt but i keep getting stuck. the other half of the question asks to derive the clausius clapyeron using the ΔH of this question so I am skeptic about the way I have approached this question.

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Last edited: Nov 21, 2011