The following data were obtained for the reaction of NO with O₂.Concentrations are in molecules/cm³ and rates are in molecules/cm³.s.
What is the rate law?

Question

The following data were obtained for the reaction of NO with O₂.Concentrations are in molecules/cm³ and rates are in molecules/cm³.s. What is the rate law?

Quizplus · Accepted Answer

The rate law is determined by how the rate changes with changes in concentration of the reactants. Doubling the concentration of NO while keeping [O2] constant quadruples the rate, indicating a second-order dependence on [NO]. Doubling the concentration of O2 while keeping [NO] constant does not change the rate, indicating zero-order dependence on [O2]. Therefore, the rate law is $Rate = k[NO]^2[O_2]^0$, which simplifies to $Rate = k[NO]^2$.

The Following Data Were Obtained for the Reaction of NO