Question

What is rate law?

Answer 1

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.