The reaction of NO and O2 produces NO2. 2 NO(g) + O2(g) → 2 NO2(g) The reaction is second-order with respect to NO(g) and first-order with respect to O2(g). At a given temperature, the rate constant, k, equals 4.7  102 M–2 s –1 . What is the rate of reaction when the initial concentrations of NO and O2 are 0.025 M and 0.015 M, respectively? a. 2.6  10–3 M/s b. 4.4  10–3 M/s c. 0.18 M/s d. 2.0  10–8 M/s e. 3.8  102 M/s

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