Chemistry
posted by Marcus .
I'm working on a problem dealing with calculating the heat of vaporization for vapor pressures problem.
By substituting the problems values into the ClausuisClapeyron equation I get:
.642= (2.28x105) x Delta H vap (J/mol)
However, from this point I don't know how to calculate a correct Delta H value?

It would be easier to help if you posted the complete problem along with the work you've done. If you're sure of what you've done to this point, the next step is
dHvap = 0.642/2.28E5