Question

The half-life for a reaction that is first order in A 15 minutesHow long will it take for the concentration of A to change from 0.16 M to 0.040 M?

Question 27 3.33 pts The half-life for a reaction that is first order in A is 15 minutes. How long will it take for the concentration of A to change from 0.16 M to 0.040 M? A(9) - B(g) + C(9) 15 min 60 min 23 min 45 min 30 min

Answer 1

any query please comment.

Given, = 15 min Half-life of reaction ll. til = 15 min sog rate constant K = 0.693 for the reaction = 0.693 0.0462 min 15 min To know the time required to change the concentration from 0.16M to 0.040 m we will use the given formula :- t = 2.303 log an K . where to time required K = rate constant a= Prètial concentration a-x- final concentration, putting the values t=2.303 & log 0.16 0.0462 = 30 min t. 2.303 x log o.oto

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