What is the half$-$life of a first$-$order reaction if it takes $9\mathrm{.}60$ seconds for the concentration to decrease from $0\mathrm{.}637M$ to $0\mathrm{.}332M?$

$9\mathrm{.}86s$

$9\mathrm{.}52s$

$10\mathrm{.}2s$

$6\mathrm{.}79E-2s$

$9\mathrm{.}11s$

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nherst, MA USA