Homework Help: Chemistry

Posted by Hannah on Tuesday, February 7, 2012 at 5:43pm.

The vapor pressure of the liquid HF is measured at different temperatures. The following vapor pressure data are obtained.

Temperature(K) Pressure mmHg
250 129.63
260 206.65
270 318.22
280 475.16

Determine the enthalpy of vaporization.

I have know idea how to start this. Thank yoou for your help.

Chemistry - DrBob222, Tuesday, February 7, 2012 at 5:58pm
You are supposed to plot ln p vs 1/T. You will get a straight line with a negative slope. The slope = dHvap/R.
Chemistry - Hannah, Tuesday, February 7, 2012 at 6:14pm
Ok when I did the graph I got -2.99e3 as the slope. Is this the answer or do I have to do something else now?
Chemistry - Hannah, Tuesday, February 7, 2012 at 6:16pm
Nevermind I actually figured it out. Thank you.

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