Chemistry

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

asked by Emma
  1. Hvap = Rln(P2/P1)
    ----------
    (1/T1 - 1/T2)

    posted by Anonymous
  2. Rln(P2/P1)
    _____________
    (1/T1 - 1/T2)

    posted by Anonymous

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