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In a bimolecular reaction the steric factor P is experimentally found to be 4.5. Which of the following statement(s) is/are correct?

1. The frequency factor predicted by the Arrhenius equation is greater than the experimentally determined value
2. The activation energy of the reaction is independent of the value of the steric factor
3. Because P = 4.5, the reaction cannot proceed without an effective catalyst
4. The experimentally determined frequency factor is greater than the value predicted by the Arrhenius/collision theory

Correct answer: The experimentally determined frequency factor is greater than the value predicted by the Arrhenius/collision theory

Solution

Since the experimental frequency factor A_exp = P * A_theory and P = 4.5 > 1, the experimental frequency factor exceeds the theoretical one; the activation energy is unaffected by P, so both statements B and D are correct (D is the keyed best answer).

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