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An Elementary Step's Rate Law Follows From Its Molecularity

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Unlike a reaction's rate law, an elementary step's rate law is written from its equation, since coefficients count colliding particles.

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The bimolecular step O3 + O → 2 O2 has rate law rate = k[O3][O], read straight from its coefficients.

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This works only for a single elementary step — applying it to a multistep equation is the Chem 1641 error.