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. The data is shown in this table.

n learning Map The vapor pressure, P, of a certain liquid If you were going to graphically determine the enthalpy of was measured at two temperatures, T vaporizaton, AHvap, for this liquid, what points would you plot? The data is shown in this table. Number Number T (K) P (kPa) To avoid rounding point 1: 225 3.40 errors, use three significant figures in 625 761 the x values and four Number Number significant figures in NOTE: Keep the pressure units in kPa they values. point 2 Determine the rise, run, and slope of the line formed by these points. slope rise run Number Number Number What is the enthalpy of vaporization of this liquid? Number J mol AH vap AO Previous Give Up & View solution Check Answer Next Exit

Explanation / Answer

Let T(K) be x and P(kPa) your y

Point 1: x1= 1/225=0.004, y1=ln(3.40)= 1.223
Point 2: x2= 1/625= 0.0016, y2=ln(7.61)= 2.029

Rise= y2-y1= 2.029-1.223= 0.806
Run= x2-x1= 0.0016-0.004= -0.0024
Slope= y2-y1/x2-x1= 0.806/-.0024= -335.83

deltaHvap= mxR= 335.83x8.314= 2792.09 J/mol
(R is a constant)

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