Rate equation of Rate expression or Rate Law is the methematical expression in which `aA + bB to cC+dD` reaction rate is given in terms of molar concentration of reactants. Where a,b and d are the stoichiometric coeffcients of reactants and products. The rate expression for this reaction is Rate `alpha[A]^(x)[B]^(y)`
Exponents x and y may or may not equal to stiochiometric coefficients a and b.
Rate `=K [A]^(x)[B]^(y)` Where K is proporationality constant called rate constant.