1.

Explain the law of mass action and give its mathematical representation.

Answer»

Statement: The law of mass action states that the rate of a chemical reaction at each instant is proportional to the product of concentrations of all the reactants. Explanation: A rate equation can be written for a reaction by applying the law of mass action as follows: Consider a reaction, A + B → C Here A and B are the reactants and C is the product. The concentrations of chemical species are expressed in mol L-1 and denoted by putting the formula in square brackets. On applying the law of mass action to this reaction, a proportionality expression can be written as: Rate ∝ [A] [B]

This proportionality expression is transformed into an equation by introducing a proportionality constant, k, as follows: Rate = k [A] [B]

This equation is called the rate equation and the proportionality constant, k, is called the rate constant of the reaction.



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