gnment Attempts Score 7/4/2018 1159 PM 18/20 7/4/2018 10:45 PM Gradebook PrintCa

Question

gnment Attempts Score 7/4/2018 1159 PM 18/20 7/4/2018 10:45 PM Gradebook PrintCakculatorPeriodic Table Question 9 of 12 Map cos The vapor pressure, P, of a certain was If you were going to graphically determine the enthalpy vaporizaton, Hhap for this liquid, what points would you plot? measured at two temperatures, T. The data is shown in this table. Number T(K) P (kPa) 275 302 525 8.73 To avoid rounding errors, use three significant igures in the x values and four significant figures in the y values point 1: NOTE: Keep the pressure units in kPa point 2:n Determine the rise, run, and slope of the line formed by these points 8 3 90 slope Number Number 10 1 What is the enthalpy of vaporization of this liquid? Number 12 J/ mol Previous & Give Up & Vew Solution Check Answer Next ExtH Hint 0 Type here to search

Explanation / Answer

From the Clausius-Clapeyron equation

ln P = ln A + (-Hvap/R) (1/T)

y = c + mx

ln P vs 1/T graph will give the Hvap value.

Point 1

x1 = 1/T1 = 1/275 = 0.00364

y1 = ln P1 = ln 3.02 = 1.10523

Point 2

x2 = 1/T2 = 1/525 = 0.00190

y2 = ln P2 = ln 8.73 = 2.16677

Rise = y2 - y1 = 2.16677 - 1.10523 = 1.06154

Run = x2 - x1 = 0.00190 - 0.00364 = - 0.00174

Slope = rise/run = 1.06154/( - 0.00174) = - 610.080

Slope = m = (-Hvap/R) = - 610.080

Hvap = 610.080 x 8.314 = 5072.21 J/mol

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