This question requires knowledge of logs - and I cannot remember how to do those

Question

This question requires knowledge of logs - and I cannot remember how to do those problems- let alone use my calculator for them.

Any help on your method to figuring this out, step by step would help.

Map The vapor pressure, P, of a certain liquid was measured at two temperatures, T. It you were going to graphically determine the enthalpy of vaporizaton, Hap, for this liquid, what points would you plot? The data is shown in this table .V Number Number T (K) P (kPa) 275 6256.01 To avoid rounding errors, use three significant figures in the x values and four significant figures in the y values point 1 3.18 Number Number NOTE: Keep the pressure units in kPa point 2 Tools Determine the rise, run, and slope of the line formed by these points x 102 rise run slope Number Number Number at is the enthalpy of vaporization of this liquid? Number J/ mol Vap

Explanation / Answer

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

P = 3.18

ln P = ln (3.18) = 1.15688

T = 275.0

1/T = 0.00364

point 1 is:

x = 0.00364

y = 1.15688

P = 6.01

ln P = ln (6.01) = 1.79342

T = 625.0

1/T = 0.0016

point 2 is:

x = 0.0016

y = 1.79342

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

rise = (y1-y2) = 1.15688 - 1.79342 = -0.63654

rise = (X1-X2) = 0.00364 - 0.0016 = 0.00204

slope = rise/run

= -0.63654/0.00204

= -312.58835

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

use

slope = - H/R

= -312.58835 = -H/8.314

H = 2599 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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