What do you understand by rate of a reaction? Explain why the rate of a reaction cannot be measured by dividing the total amount of reactant consumed by the time taken.

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Solution

The rate of a reaction can be defined as the change in concentration of a substance with time.
rate= $\frac{Δ c o n c e n t r a t i o n}{Δ t i m e}$
For a reaction $A + B ⟶ C$
rate= $\frac{- Δ [A]}{Δ t}$ , rate= $\frac{- Δ [B]}{Δ t}$ , rate= $\frac{Δ [C]}{Δ t}$

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What do you understand by the 'order of a reaction'? Identify the reaction order from each of the following units of reaction rate constant:

(i) $L^{- 1} m o l s^{- 1}$

(ii) $L m o l^{- 1} s^{- 1}$

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