1.

At least how many half-lives should elapse for a `1^(st)` order reaction `Ato` products so that the reaction is at least `95%` completed? `(log2=0.3)`A. 4B. 5C. 6D. 7

Answer» Correct Answer - B
`underset(0%)(100)overset(t_((1)/(2)))tounderset(50%)(50)overset(t_((1)/(2)))tounderset(75%)(25)overset(t_((1)/(2)))to`
`underset(87.5%)(12.5)overset(t_((1)/(2)))tounderset(93.75%)(6.25)overset(t_((1)/(2)))tounderset(96.875%)(3.125)`


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