The vapor pressure, P, of a certain liquidIf you were going to graphically deter

Question

The vapor pressure, P, of a certain liquidIf you were going to graphically determine the enthalpy of was measured at two temperatures vaporizaton,aHapi for this liquid, what points would you plot? The data is shown in this table. Number Number T (K) P (kPa) 225 3.17 825 5.79 To avoid rounding errors, use three significant figures in the x values and four significant figures in the y values. point 1 Number Number NOTE: Keep the pressure units in kPa point 2 Determine the rise, run, and slope of the line formed by these points rise run slope Number Number Number What is the enthalpy of vaporization of this tiquid? Number J/mol vap

Explanation / Answer

here graph is drawn between ln K   and 1/T

lnK = y -axis

1/T = x - axis

point 1:   x = 4.44 x 10^-3   ,   y = 1.154

point 2 : x = 1.21x 10^-3   , y = 1.756

rise =   y2-y1 = 0.6020

run = x2 - x1    = - 3.23 x 10^-3

slope = rise / run = - 0.6020 / 3.23 x 10^-3 = - 186.4

-H / R = slope

delta H = 186.4 x 8.314 = 1550. J / mol

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