It takes 42.0 min for the concentration of a reactant in a first–order reaction to drop from 0.45 m to 0.32 m at 25°c. how long will it take for the reaction to be 90% complete?

A chemical reaction in which the rate of reaction is directly proportional to the concentration of the reacting substance.

The example of the first-order reaction is as follows:-

To solve this question, the formula we are using this as follows:-

The integrated first order rate law is:

For 90% :

t =284 mins

Hence, the time required to complete 90% of the reaction is 284 mins.

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the answer is b. dilution