If you were going to vaporizaton, , for this liquid, what points would you plot?

Question

If you were going to vaporizaton, , for this liquid, what points would you plot? graphically determine the enthalpy of The vapor pressure, P, of a certain liquid was measured at two temperatures The data is shown in this table Number Number T (K)P (kPa) 325 3.38 875 8.31 To avoid rounding errors, use three point 1 significant figures in the x values and four significant figures in the y values. 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 liquid? Number J/mol

Explanation / Answer

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

P = 3.38

ln P = ln (3.38) = 1.21788

T = 325.0

1/T = 0.00308

point 1 is:

x = 0.00308

y = 1.21788

P = 8.31

ln P = ln (8.31) = 2.11746

T = 875.0

1/T = 0.00114

point 2 is:

x = 0.00114

y = 2.11746

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

rise = (y1-y2) = 1.21788 - 2.11746 = -0.89958

rise = (X1-X2) = 0.00308 - 0.00114 = 0.00193

slope = rise/run

= -0.89958/0.00193

= -465.12577

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

use

slope = - Hvap/R

= -465.12577 = -Hvap/8.314

Hvap = 3867 J/mol

Answer: 3867 J/mol

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