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# What is rate law?

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## Rate law:The rate law (also known as the rate equation) for a chemical reaction is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it.Expression:For a reaction given by:$\mathrm{aA}+\mathrm{bB}\to \mathrm{cC}+\mathrm{dD}$Where a, b, c, and d are the stoichiometric coefficients of the reactants or products.$\mathrm{Rate}\propto {\left[\mathrm{A}\right]}^{\mathrm{x}}{\left[\mathrm{B}\right]}^{\mathrm{y}}$$\mathrm{Rate}=\mathrm{k}{\left[\mathrm{A}\right]}^{\mathrm{x}}{\left[\mathrm{B}\right]}^{\mathrm{y}}$Where,[A] and [B] are the concentrations of the reactants A and B.x and y are the partial reaction orders for reactants A and B which may or may not be equal to their stoichiometric coefficients a and b).k= rate is constant or velocity constant.

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