Chemical Reaction Engineering
According to the 'law of mass action', the rate of reaction is directly proportional to the

Volume of the reaction vessel
Molar concentration of the reactants
Equilibrium constant
Nature of the reactants

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Of very large activation energy of many bodies
Of requirement of very large concentration for such reactions
Many body collisions are not favoured energetically
Of low probability of many body collisions

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