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## Homework Statement

Calculate the vapour pressure of H2O(g) at 298K and an overall pressure of 1 atm., using the data provided. It cannot be assumed that dHvap and dSvap are independent of temperature.

H2(g) dHcomb (298K) = -241.8kj/mol (H2(g) as a product)) Cp - 33.6

H2(g) dHcomb (298K) = -285.8kj/mol (H2(l) as a product)) Cp - 75.3

## Homework Equations

## The Attempt at a Solution

I believe I need to calculate deltaH of vaporization first then use dSvap(298) = dSvap(373)+dCpln(298/373) then use gibbs free energy?

Don't know how to get deltaH