5 ake-home Quiz on Kinetics Due: Rate constants for the reaction: cyclopropane T

Question

5 ake-home Quiz on Kinetics Due: Rate constants for the reaction: cyclopropane The data are shown in the table below. propene, were measured at four different temperatures. k (s-) 0.00018 0.0027 0.030 0.26 480 520 582 615 Plot In k versus 1/T, and find the activation energy (in kJ/mol) for the reaction. (see Sample Ex. 14.11a). Watch the units! Some conversions will be necessary. Instructions: SHOWALL WORK for full credit. (Hand-drawn plots: download plotting paper from Moodle; to draw axes and best fit straight lines use a ruler-i.e., no free-hand drawings. See Appendix A- 4 for graphing information. Pay attention to units and sig figs. Do NOT force-connect experimental points; instead try to draw the best fit straight line that goes in the vicinity of the experimental points, then find two fairly distant points on the best fit straight line to determine the slope.) You can also use Excel or another computer drawing program. A well-designed plot has a-45 slope and uses over 75% of he graphing paper (in other words, do not waste graphing paper on empty/unused areas) Sign and staple all pages before handing this assignment for grading! MESSY WORK WILL NOT BE GRADED State your answers here

Explanation / Answer

Arrhenius equation is,

ln(k2/k1) = (Ea/R) * [( 1 / T1 ) - ( 1 / T2 ) ]

ln(0.0027 / 0.00018) = ( Ea / 0.008314) * [ ( 1 / 753.15 ) - ( 1 / 793.15) ]

Ea = 336. kJ

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