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Assigned problems _5 answers

Assigned problems _5 answers - Chemistry 2080 Spring 2010...

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Chemistry 2080 Spring 2010 ANSWERS to Problem Set #5 - due date: Friday March 12th at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ 1) The rate law for the reaction: 2H 2 (g) + 2NO(g) –––––> N 2 (g) + 2H 2 O(g) is: rate = k[H 2 ][NO] 2 Say which of the following mechanisms can be ruled out on the basis of the observed rate expression, and explain why: Mechanism #1: H 2 + NO ––––––> H 2 O + N (slow) N + NO ––––––> N 2 + O (fast) O + H 2 ––––––> H 2 O (fast) Mechanism #2: H 2 + 2NO ––––> N 2 O + H 2 O (slow) N 2 O + H 2 ––––> N 2 + H 2 O (fast) Mechanism #3: 2NO N 2 O 2 (fast equilibrium) N 2 O 2 + H 2 ––––> N 2 O + H 2 O (slow) N 2 O + H 2 ––––> N 2 + H 2 O (fast) _________________________________________________________________________________ Mechanism #1: The first step is the slow step and therefore the rate-determining step. Since it is an elementary reaction, we can see that the rate of this step (and therefore of the whole reaction) is given by the following: Rate = k[H 2 ][NO] which does not have the required dependence on [NO] 2 , and is therefore incorrect.
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