. For the reaction

Question

2H2(g) + 2NO(g) → N2(g) + 2H2O(g)
The observed rate law is
Rate =k[NO]2[H2]
The mechanisms shown below have been proposed to explain the kinetics of the above reaction
Which of the following are acceptable mechanisms? Explain you answer
Mechanism I
2H2(g) + 2NO(g) → N2(g) + 2H2O(g)
Mechanism II:
H2(g) + NO(g) → N(g) + H2O(g) (slow)
N(g) + NO(g) → N2(g) + O(g) (fast)
H2(g) + O(g) → H2O(g) (fast)
Mechanism III

H2(g) + 2NO(g) → N2O(g) + H2O(g) (slow)
N2O(g) + H2(g) → N2(g) + H2O(g) (fast)

Answer 1

Mech. #3
The original and mech. #3 are both 2nd order and have the same rate law.
Rate law= k[NO]^2[H2]

Answer 2

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Answer 3

GIMME THE ABSOLUTE ANSWER