Map The vapor pressure, P, of a certain liquid was measured at two temperatures

Question

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, dHap, for this liquid, what points would you plot? The data is shown in this table. Number Number T (K) P (kPa) 325 3.59 675 6.41 To avoid rounding errors, use three significant figures in the x values and four significant figures in the y values point 1:0 Number Number NOTE: Keep the pressure units in kPa point 2:n 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 ] Exit Hint O Previous Give Up & View Solution e Check Answer 0 Next

Explanation / Answer

here graph is drawn between ln K   and 1/T

lnK = y -axis

1/T = x - axis

point 1:   x = 2.67 x 10^-3   ,   y = 1.278

point 2 : x = 1.48 x 10^-3   , y = 1.858

rise =   y2-y1 = 0.580

run = x2 - x1    = - 1.19 x 10^-3

slope = rise / run = - 0.88 / 3.30 x 10^-3 = - 487

-DH / R = slope

DHvap = 487 x 8.314 = 4052 J / mol

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