E Print Calculator Periodic Table Question 28 of 30 Map A Sapling Learning macmi

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E Print Calculator Periodic Table Question 28 of 30 Map A Sapling Learning macmillan learning The equilibrium constant, K, of a certain first If you were going to graphically determine the enthalpy, order reaction was measured at two AHO, for this reaction, what points would you plot? temperatures, T. The data is shown in this table. Number Number To avoid rounding errors, use three point 1 T (K) K significant figures in 325 3.68 the X values and four significant figures in Number Number 825 6.31 the y values. point 2: Determine the rise, run, and slope of the line formed by these points. rise run slope Number Number What is the standard enthalpy of this reaction? Number J mol AH Previous 3 Give Up & View Solution Check Answer Next Exit Hint

Explanation / Answer

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

K = 3.68

ln K = ln (3.68) = 1.30291

T = 325.0

1/T = 0.00308

point 1 is:

x = 0.00308

y = 1.30291

K = 6.31

ln K = ln (6.31) = 1.84214

T = 825.0

1/T = 0.00121

point 2 is:

x = 0.00121

y = 1.84214

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rise = (y1-y2) = 1.30291 - 1.84214 = -0.53922

rise = (X1-X2) = 0.00308 - 0.00121 = 0.00186

slope = rise/run

= -0.53922/0.00186

= -289.15829

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

use

slope = - Ho/R

= -289.15829 = -Ea/8.314

Ho = 2404.06 J/mol

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