Question

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

The vapor pressure, ?P, of a certain liquid was measured at two temperatures, ?T. The data is shown in the table.

T (K) P (kPa)
225 3.75
825 6.26

Keep the pressure units in kPa.

If you were going to graphically determine the enthalpy of vaporizaton, Δ?vapΔHvap, for this liquid, what points would you plot? To avoid rounding errors, use three significant figures in the x-values and four significant figures in the y-values.

point 1: x=

point 1: y=

point 2: x=

point 2: y=

Determine the rise, run, and slope of the line formed by these points.

Rise =

Run =

Slope =

What is the enthalpy of vaporization of this liquid? In J/mol.

Science   Chemistry   
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Homework Answers

Answer #1

We need to plot lnP on y axis and 1/T on x axis

P = 3.75

ln P = ln (3.75) = 1.32176

T = 225.0

1/T = 0.00444

point 1 is:

x = 0.00444

y = 1.32176

P = 6.26

ln P = ln (6.26) = 1.83418

T = 825.0

1/T = 0.00121

point 2 is:

x = 0.00121

y = 1.83418

----------------------------------------------------------------------------

rise = (y1-y2) = 1.32176 - 1.83418 = -0.51242

rise = (X1-X2) = 0.00444 - 0.00121 = 0.00323

slope = rise/run

= -0.51242/0.00323

= -158.53128

----------------------------------------------------------------------------

use

slope = - HVap/R

-158.53128 = -HVap/8.314

HVap = 1318 J/mol

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