APFIVE Evaluating a Reaction Mechanism
The following two-step mechanism is proposed for the reaction 2NO(g) + O₂(g) → 2NO₂(g):
Step 1: NO + NO ⇌ N₂O₂
Step 2: N₂O₂ + O₂ → 2NO₂
Which statement correctly evaluates this mechanism?
A
The mechanism is invalid because N₂O₂ appears in the overall equation
B
The mechanism is valid because the sum of elementary steps equals the overall equation
C
The mechanism is valid only if Step 1 is the rate-determining step
D
The mechanism is invalid because the stoichiometry doesn’t balance
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