Question 6 of 18 Map de The vapor pressure, P, of a certain liguid was measured

Question

Question 6 of 18 Map de The vapor pressure, P, of a certain liguid was measured at two temperatures If you were going to graphically determine the enthalpy of vaporizaton, AHup for this liquid, what points would you plot? l. The data is shown in this table. Number Number T(K) P (kPa) 275 3.79 775 7.02 To avoid rounding errors, use three significant figures in the x values and four significant figures in the y values. point 1 | | Number 1p Number NOTE: Keep the pressure units in kPa. point 21 : Determine the rise, run, and slope of the line formed by these points. slope rise run Number What is the enthalpy of vaporization of this liquid? Numbe J/mol

Explanation / Answer

Point 1 Point 2

Y intercept P1 = 3.79 kPa P2 =7.02 kPa

X intercept T1 = 275 K T2 = 775 K

ln ( P2/P1) = (- delta Hvap/R )* (1/T2 - 1/T1)

ln (7.02 kPa / 3.79 kPa) = (- delta Hvap / 8.314 J/mol K )* (1/775K- 1/275K)

0.616 = delta Hvap * 2.821

delta Hvap = 0.218 J/ mol

Rise = Y2 - Y1 = 3.23

Run = X2 - X1 = 775 - 275 = 500

Slope = Rise/Run = Y2 - Y1 / X2 - X1 =  7.02 - 3.79 / 775 - 275 = 6.46 * 10-3

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