E. Determination of Eneygy of Activation OtioaFind Taiel cancentratio Reaction m

Question

E. Determination of Eneygy of Activation OtioaFind Taiel cancentratio Reaction mixture used (same for all temperatures) of[.) aame Time for reaction at about 10c 19sc Temperatureuc K Time for reaction at about 09 seTemperature Time for reaction at room temp 57.6-sec 4o c 313 K Calculate the rate constant at each temperature from your data, following the procedure in Part C Rate In k -10 C 40C Room temp Plot In k vs. 1T using Excel or the graph paper on the following page. Find the slope of the best straight line through the points. (If you need to, see Appendix V) Slope - By Equation 2: E.-8.31 x slope joules

Explanation / Answer

Slope = - Ea/R

From the graph

Slope = (y2-y1) / (x1-x2)

= [(-8.75)-(-10.10)] / [ (3.19*10^-3)-(3.40*10^-3)]

= 1.35/(-0.21*10^-3)

= - 6428.5714

Negative sign shows the downward slope.

Activation energy Ea = - slope x R

Ea = - 8.314 x (-6428.5714)

Ea = 53447.143 J

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