CHEM 1250 Quiz: CHEM1250 Quiz 3 2016 Spring
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1. (8 pts) the following mechanism has been proposed for the gas-phase reaction between x2 and by. k1. Things that don"t appear in overall eqn. , but appear in mechanism are either intermediates or catalysts. Intermediates appear for first time as a product and used in following step(s) as a reactant. Shouldn"t have intermediate, x, in the rate law - use step 1 (fast equilibrium step) to find [x] For step 1 rateforward 1 = ratereverse 1. Write rate law for each rate k1 [x2] = k-1 [x]2 solve for [x] Substitute this into rate eqn base on step 2. Copyright r. j. zellmer, april 22, 2016 r = k2 [x] [by] r = k2 { (k1/k-1) [x2] }1/2 [by] r = k2 (k1/k-1)1/2 [x2]1/2 [by] r = k [x2]1/2 [by] where, k = k2 (k1/k-1)1/2. 2. (10 pts) for the following reaction kc equals 2. 4 x 10!5, at 25ec.
