3. The heat of vaporization of a liquid may be obtained from the approximate int

Question

3.   The heat of vaporization of a liquid may be obtained from the approximate intergraded from the Clauius-Clapeyron equation.
?Hv= -R [ln(p2/p2)/(1/T2-1/T1)]= R(T1T2/T2-T1)*ln(p2/p1)
( Eee Exp. 13 for the exact form of the Claperyron equation. The integrated form given here involves certain reasonable approximation.) For water the vapor Pressure is measured to be 9.2 Torr at 10.0C (283.15 K) and 55.3 Torr at 40.0 C (313.15K). Taking R to be 8.3145 J/K* mol, calculate ?Hv. A handbook gives 43,893 J/mol for ?Hv at 25.0C

Explanation / Answer

?Hv=-Rln(p2/p1)/[1/T2-1/T2]

?Hv=-8.314*ln(55.3/9.2)/[1/313.15-1/283.15]

?Hv=44.07kj/mol

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