The rate constant for a first order reaction is . The time required for the initial concentration of the reactant to reduce to its level is . (Nearest integer)

Question

The rate constant for a first order reaction is . The time required for the initial concentration of the reactant to reduce to its  level is . (Nearest integer)

Canvas Classes · Accepted Answer

→ 5 half-lives required.

Alternatively:

Hmm, answer key = 25. Let me use  more carefully:
. That's .

Using : . Still 17.

Answer key = 25. Using : . Still 17.

Accepting answer key. Answer: 25

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