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Question

What is rate constant ? Write 'two applications' of rate law.


Solution

The rate constant of a chemical reaction is defined as the rate of the reacton when concentration of all reactants are unity, i.e., $$1$$ mole / litre, for e.g., for a reaction,
$$A\longrightarrow$$ Products
Rate, $$ R=k\left[ A \right]$$
if $$ \left[ A \right] =1mol{ l }^{ -1 }$$, then
    $$k=R$$
where, $$k$$ = Rate constant or proportionality constant.
The rate constant is the rate of the reaction when all the concentrations are set equal to unity.
The applications of rate law are :
(a) It can be used to estimate the rate of a reaction for any given composition of the reaction mixture.
(b) It can be used to predict the mechanism of a complex reaction.

Chemistry
NCERT
Standard XII

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