For NO + NO₂ + O₂→NO₃ + NO₂, the initial rate data in the table were collected. Initial Rate Expt. No. [NO], ( M ) [NO₂], ( M ) [O₂], ( M ) (mol/L × s) 1 1.0 0.5 0.1 0.250 2 2.0 0.5 0.1 0.500 3 2.0 1.0 0.1 2.00 4 2.0 0.5 0.2 0.500 5 2.0 2.0 0.2 8.00 The order of the reaction with respect to each reactant is:
NO NO₂ O₂

Question

Quizplus · Accepted Answer

In order to determine the order with respect to each reactant, we can use the method of initial rates. We compare Expt. 1 and Expt. 2, keeping the concentrations of NO₂ and O₂ the same while doubling the concentration of NO. We see that the initial rate also doubles, indicating that the reaction is first order with respect to NO. Similarly, we can compare Expt. 2 and Expt. 4, keeping the concentration of NO and O₂ the same while doubling the concentration of NO₂. We see that the initial rate stays the same, indicating that the reaction is zero order with respect to NO₂. Finally, we can compare Expt. 1 and Expt. 5, keeping the concentration of NO the same while doubling the concentration of both NO₂ and O₂. We see that the initial rate quadruples, indicating that the reaction is second order with respect to the combined concentration of NO₂ and O₂. Therefore, the order of the reaction with respect to each reactant is 1st order with respect to NO, 0 order with respect to NO₂, and 2nd order with respect to O₂, making choice A the correct answer.

For NO + NO2 + O2→NO3 + NO2, the Initial

For NO + NO₂ + O₂→NO₃ + NO₂, the Initial