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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.
1 According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.  The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.