Discussion
Consider the following statements about order and molecularity.
1. Order is determined from experimental rate data.
2. Molecularity applies only to an elementary step.
3. Order and molecularity are always numerically equal.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: order comes from experiment, and molecularity is meaningful only for an elementary step, since an overall equation is a summary rather than a mechanism. Statement 3 is true only for elementary reactions and false in general - the equality is the exception that identifies a step as elementary, not a rule that applies to overall reactions.
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