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For the reaction between nitric oxide and bromine forming nitrosyl bromide, the following sequence is suggested: NO(g) + Br2(g) → NOBr2(g) NOBr2(g) + NO(g) → 2NOBr(g) If the second step controls the rate, what is the reaction order with respect to NO(g)?

1. 3
2. 2
3. 1
4. 0

Correct answer: 2

Solution

The reaction order with respect to NO(g) is 2 because the rate-determining step involves two molecules of NO(g) reacting with NOBr2(g), indicating that the concentration of NO(g) is squared in the rate law.

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