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find the order of the following reaction :-2H2O2 -----> 2H2O +O2
order cannot be predicted just by seeing the balanced reactionmolecularity is 2
Order of reaction is defined as the sum of powers to which the concentration terms are raised in the rate law equation to express the observed rate of the reaction. Decomposition of hydrogen peroxide is an example of dependence of rate of reaction on concentration of single reactant.With different concentrations of H2O2,when series of trials are performed it is found that rate of reaction increases with direct proportion to the original concentration of H2O2 which is expressed mathematically as – rate = k[H2O2]The above equation is called as the rate law for decomposition of H2O2.k is called as rate constant.Since in rate law expression rate is directly proportional to the concentration of a reactant which is H2O2,so decomposition of H2O2 is an first-order reaction.
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