The vapor pressure, P, of a certain liquid was measured at two temperatures, T.

Question

The vapor pressure, P, of a certain liquid was measured at two temperatures, T. If you were going to graphically determine the enthalpy of vaporization, delta H_vap, for this liquid, what points would you plot? The data is shown in this table. To avoid rounding errors, use three significant figures in the x values and four significant figures in the y values. Determine the rise, run, and slope of the line formed by these points. What is the enthalpy of vaporization of this liquid? delta H_vap = J/mol

Explanation / Answer

ln(p2/p1) = DHvap/R[1/T1-1/T2]

ln(5.44/3.35) = (x/8.314)((1/275)-(1/725))

x = DHvap = 1785 j/mol

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