estimate the heat of vaporization of water if the vapor pressure is 17.54 torr at 20C and 149.4 torr at 60C. R=8.314 J/mole K. I can't remember how to set up the problem. Would someone be able to send me the formula? Thank you

Answer 1

Hvap = Rln(P2/P1)
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(1/T1 - 1/T2)

Answer 2

Rln(P2/P1)
_____________
(1/T1 - 1/T2)