Discussion
Consider the following statements about a Langmuir-Hinshelwood rate law.
1. It can predict a maximum in rate against reactant pressure.
2. It reduces to a power law over a limited range.
3. Its parameters always have a clear physical meaning when fitted.
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: with both reactants competing for sites the rate can rise, peak and fall as one of them is raised, and over a narrow range the expression is well approximated by a power law. Statement 3 claims too much - fitted adsorption constants frequently come out negative or physically implausible, and are then merely parameters that happen to fit.
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