Discussion
Reaction order differs from molecularity in that order is
Answer: C
Correct answer: determined experimentally and need not be a whole number
Order is an empirical description of how the rate responds to concentration, obtained by fitting data, and it may be fractional, zero or even negative - a chain reaction commonly shows an order of one half, and a product-inhibited reaction a negative one. Molecularity counts the molecules taking part in one elementary step and is necessarily a small positive integer.
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