Which of the following statements about **order vs molecularity** is correct?
AMolecularity can be fractional; order cannot
BOrder = molecularity for every reaction
CBoth are always equal to stoichiometric coefficients
DOrder is experimentally determined; molecularity is the number of molecules in an elementary step
Answer & Solution
Correct answer: D. Order is experimentally determined; molecularity is the number of molecules in an elementary step
Order is determined from the experimental rate law (can be 0, fractional, or negative). Molecularity is the count of molecules in a single elementary step (always a positive integer). For a multi-step reaction the order need not match the overall stoichiometry.
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