Map If you were going to graphically determine the enthalpy of The vapor pressur

Question

Map If you were going to graphically determine the enthalpy of The vapor pressure, P, of a certain liquid was measured at two temperatures, T. vaporizaton, vap for this liquid, what points would you plot? The data is shown in this table. Number Number T (K) P (kPa) To avoid rounding point 1: 325 3.41 errors, use three significant figures in 575 5.50 the X values and four Number Number significant figures in NOTE: Keep the pressure units in kPa the y values. point 2 Determine the rise, run, and slope of the line formed by these points. slope rise run Number Number Number What is the enthalpy of vaporization of this liquid? Number J mol AH vap

Explanation / Answer

Let T(K) be x and P(kPa) your y

Point 1: x1= 1/325= .00307, y1=ln(3.41)= 1.22
Point 2: x2= 1/575= .00173, y2=ln(5.50)= 1.70

Rise= y2-y1= 1.70-1.22= 0.48
Run= x2-x1= .00173-.00307= -.00134
Slope= y2-y1/x2-x1= .48/-.00134= -358.208

deltaHvap= mxR= 358.208x8.314= 2978.14 J/mol

(R is a constant)

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