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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in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.

answerlinnaeus;