AP Chemistry
5.9 Pre-Equilibrium Approximation
5.8 Reaction Mechanism and Rate Law
5.7 Introduction to Reaction Mechanisms
5.4 Elementary Reactions
A student investigates the gas-phase formation of nitrosyl bromide, represented by the overall reaction
\[2\text{NO(g)}+\text{Br}_2\text{(g)}\rightarrow 2\text{NOBr(g)}\]
The following two-step mechanism is proposed.
\[\text{NO(g)}+\text{Br}_2\text{(g)}\rightleftharpoons\text{NOBr}_2\text{(g)}\qquad \text{fast}\;(k_1,k_{-1})\]
\[\text{NOBr}_2\text{(g)}+\text{NO(g)}\rightarrow 2\text{NOBr(g)}\qquad \text{slow}\;(k_2)\]
Which of the following is the rate law for the overall reaction expressed only in terms of reactant concentrations and elementary-step rate constants?
\[2\text{NO(g)}+\text{Br}_2\text{(g)}\rightarrow 2\text{NOBr(g)}\]
The following two-step mechanism is proposed.
\[\text{NO(g)}+\text{Br}_2\text{(g)}\rightleftharpoons\text{NOBr}_2\text{(g)}\qquad \text{fast}\;(k_1,k_{-1})\]
\[\text{NOBr}_2\text{(g)}+\text{NO(g)}\rightarrow 2\text{NOBr(g)}\qquad \text{slow}\;(k_2)\]
Which of the following is the rate law for the overall reaction expressed only in terms of reactant concentrations and elementary-step rate constants?
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