An overall reaction between nitric oxide and hydrogen is given as follows: 2NO + 2H2 → N2 + 2H2O From experimental reaction testing data, you find the following empirical rate expression: rN2 = k[NO]2[H2] Two of your best engineers, Cassie and Miguel, have proposed different mechanisms for the observed rate. (Part a) Show using the rate determining step approximation. Are either of the proposed mechanisms (or both) consistent with the empirical rate expression? Cassie’s proposed mechanism k1 Step 1: 2NO + H2 → N2 + H2O2 (slow) k2 Step 2: H2O2 + H2 → 2H2O (fast)
An overall reaction between nitric oxide and hydrogen is given as
follows: 2NO + 2H2 → N2 + 2H2O
From experimental reaction testing data, you find the following
empirical rate expression: rN2 = k[NO]2[H2]
Two of your best engineers, Cassie and Miguel, have proposed different
mechanisms for the observed rate. (Part a) Show using the rate
determining step approximation. Are either of the proposed
mechanisms (or both) consistent with the empirical rate expression?
Cassie’s proposed mechanism
k1
Step 1: 2NO + H2 → N2 + H2O2 (slow)
k2
Step 2: H2O2 + H2 → 2H2O (fast)
Miguel’s proposed mechanism
k3
Step 1: 2NO ↔ N2O2 (fast)
k4
k5
Step 2: N2O2 + H2 → N2 + H2O2 (slow)
k2
Step 3: H2O2 + H2 → 2H2O (fast)
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