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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explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.