Can someone glance over my work and see if it looks right? I'm certain about it because my units seem to be a little odd.

Chloroform, CHCl3, has a vapor pressure of 197 mmHg at 23. degrees C and 448 mmHg at 45 degrees C. Estimate the heat of vaporization.

ln P2/P1= heat of vap/R[ 1/T1 - 1/T2]
with some rearranging...
[ln P2/P1]/heat of vap= 1/R[1/T1 - 1/T2]

[ln .5894 atm/.2592 atm/H of V= 1/8.314 J/mol K[1/296.2 K - 1/318.2 K]

.8215 atm/H of V= .00002807 J/mol
1/H of V= .00003416 J/mol atm
H of V= 2.927 x 10^4 J/mol atm

I obtained a SLIGHTLY different answer but it differs onoy in the 4th place so I think the problem is ok.

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