The exponents in a rate law can be found:
Select the correct answer below:
O from the stoichiometric coefficients of the reaction
O from the molar masses of the compounds
O by experiment only
O none of the above

by experiment only

Explanation:

According to the law of mass action:-

The rate of the reaction is directly proportional to the active concentration of the reactant which each are raised to the experimentally determined coefficients which are known as orders. The rate is determined by the slowest step in the reaction mechanics.

Order of in the mass action law is the coefficient which is raised to the active concentration of the reactants. It is experimentally determined and can be zero, positive negative or fractional.

The order of the whole reaction is the sum of the order of each reactant which is raised to its power in the rate law.

Thus, the exponents in the rate law, the order is determined by experiment only.

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