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 = 0.642/2.28E-5
I'm working on a problem dealing with calculating the heat of vaporization for vapor pressures problem.
By substituting the problems values into the Clausuis-Clapeyron equation I get:
.642= (2.28x10-5) x Delta H vap (J/mol)
However, from this point I don't know how to calculate a correct Delta H value?
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