# Working with heat of vaporization

Not what you're looking for? Search our solutions OR ask your own Custom question.

I have attached the graphs. I don't think the first one is useful, but i needed to plot the data and find the heat of vaporization. Hence, the reason for the second graph. I know that the slope is equal to the heat of vaporization/RT but I don't think I am getting the right answer.

Â© BrainMass Inc. brainmass.com December 24, 2021, 4:49 pm ad1c9bdddfhttps://brainmass.com/chemistry/physical-chemistry/working-heat-vaporization-9520

## SOLUTION This solution is **FREE** courtesy of BrainMass!

Convert the temperarure values to Kelvin by the addition of 273. take ln of the vapor pressure values and plot. you haven't converted temp to kelvin scale and you took log instead of ln.

Plot ln p versus 1/T. The slope of this line is equal to the negative of the heat of vaporization divided by the gas constant.

We are making use of the Clausius-Clapeyron equation.

ln P = - [dH/R](1/T) + C

this is of the form y = mx + c with m as slope.

Â© BrainMass Inc. brainmass.com December 24, 2021, 4:49 pm ad1c9bdddf>https://brainmass.com/chemistry/physical-chemistry/working-heat-vaporization-9520