When a reaction mechanism is given, the rate law can be determined using the slow step in the reaction mechanism.
▪ rate law only involves the reactants
▪ the coefficients of the reactants in the slow step are the order of the reaction with respect to that reactant
▪ Rate Law has a general form of:
The proposed mechanism for the formation of hydrogen bromide can be written in a simplified form as:
Br2(g) ⇌ 2 Br(g) Fast, k1 (forward), k–1 (reverse)
Br(g) + H2(g) → HBr(g) + H(g) Slow, k2
H(g) + Br2(g) → HBr(g) + Br(g) Slow, k3
What rate law corresponds to this mechanism?
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Reaction Mechanism concept. If you need more Reaction Mechanism practice, you can also practice Reaction Mechanism practice problems.
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