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# exam4key - Chemistry 4511 Exam 4 1 a b c 2 a b c 3...

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Chemistry 4511 Name ________________________ Exam 4 1 a ______________________/5 b ______________________/10 c ______________________/10 2 a ______________________/30 b ______________________/8 c ______________________/7 3 ______________________/30 Total ______________________/100 Given: Planck’s Constant h = 6.626 x 10 -34 J s Speed of light c = 3 x 10 8 m/s

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1. The following data is obtained for the reaction A + B Æ P with an initial concentration of A of 1 x 10 -4 M. [B] (mol/L) k (s -1 ) T (K) 1. 0.200 13 273 2. 0.200 87 330 3. 0.100 6.5 273 4. 0.100 43.5 330 a. What is the overall rate expression for this reaction? What is the special experimental condition that has been set up here called? (5 pts) This is a pseudo-first order experiment, where the concentration of B is held high to keep it relatively constant. The rate d[P]/dt = k’[A] will hold true where k’ = k[B] n . n can be determined by observing the change in k’ with [B]. In this case, the change in one to one, so k’ = k[B] 1 . This tells us that it is first order with respect to B and the units on k listed above tell us it is first order with respect to A. This gives us a total expression b. What is the true value for the rate constant at both 273 and 330 K? (10 pts) To calculate the true rate constant, use k = k’/[B].
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exam4key - Chemistry 4511 Exam 4 1 a b c 2 a b c 3...

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