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law of mass action - (chemistry) the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances. 1  law of nature, law - a generalization that describes recurring facts or events in nature; the laws of thermodynamics.
Best Answer: Then it is first order in Cl2 and second order in NO, as predicted by the law of mass action. The reaction is third order, overall, and the molecularity is 3. The rate law is rate = k [NO]^2 [Cl2] Source(s):