Just the answers are sufficient, no explanation needed. Map The vapor pressure,

Question

Just the answers are sufficient, no explanation needed.

Map The vapor pressure, P, of a certain liquid was measured at two temperatures If you were going to graphically determine the enthalpy or vaporizaton, AHap, for this liquid, what points would you plot? The data is shown in this table. Number Number T(K) P (kPa) 275 3.72 575 7.85 To avoid rounding errors, use three significant figures in the x values and four significant figures in the y values point 1 up o Number Number NOTE: Keep the pressure units in kPa. point 2 You n yo O eTe Determine the rise, run, and slope of the line formed by these points. rise run O Hel Number Number O Wel Tec What is the enthalpy of vaporization of this liquid? J/ mol

Explanation / Answer

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

P = 3.72

ln P = ln (3.72) = 1.31372

T = 275.0

1/T = 0.00364

point 1 is:

x = 0.00364

y = 1.31372

P = 7.85

ln P = ln (7.85) = 2.06051

T = 575.0

1/T = 0.00174

point 2 is:

x = 0.00174

y = 2.06051

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

rise = (y1-y2) = 1.31372 - 2.06051 = -0.74679

rise = (X1-X2) = 0.00364 - 0.00174 = 0.0019

slope = rise/run

= -0.74679/0.0019

= -393.62049

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

use

slope = - HVap/R

= -393.62049 = -HVap/8.314

HVap = 3273 J/mol

Answer:  3273 J/mol

Feel free to comment below if you have any doubts or if this answer do not work. I will edit it if you let me know

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