Question

A certain first-order reaction a → b is 25% complete in 42 min at 25°c. What is the half-life of the reaction?.

Answer 1

A certain first-order reaction a → b is 25% complete in 42 min at 25° Half - life period (t1/2) = 240.85 minutes.

steps involved:

Time required for 25% reaction completion is equal to 442 minutes (a = 100, x = 25, a - x = 75), and t = 42 minutes.

Equation: k=2.303tlogaax,t1/2=0.693k

k=2.303100log10010025 =2.303100log10075 =2.303100log43 =2.3031000.1249 is the solution.

Rate constant (k) = 2.8773 103 min 1 t1/2 = 0.69 3 K = 6932.8773 = 240.85

The half-life (t1/2) is 240.85 minutes.

To learn more about half life refer : brainly.com/question/1160651

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