Reaction rate constant

Coefficient of rate of a chemical reaction

In chemical kinetics, a reaction rate constant or reaction rate coefficient (⁠ k {\displaystyle k} ⁠) is a proportionality constant which quantifies the rate and direction of a chemical reaction by relating it with the concentration of reactants. For a reaction between reactants A and B to form a product C, where A and B are reactants C is a product a, b, and c are stoichiometric coefficients, the reaction rate is often found to have the form: r = k [ A ] m [ B ] n {\displaystyle r=k[\mathrm {A} ]^{m}[\mathrm {B} ]^{n}} Here ⁠ k {\displaystyle k} ⁠ is the reaction rate constant that depends on temperature, and [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is taking place throughout the volume of the solution. (For a reaction taking place at a boundary, one would use moles of A or B per unit area instead.) The exponents m and n are called partial orders of reaction and are not generally equal to the stoichiometric coefficients a and b.

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