693}{k}$
where $t_{1/2}$ is the half-life and $k$ is the rate constant.
$t_{1/2} = \frac{0.693}{1.8 \times 10^{-5}\,\text{s}^{-1}}$
To convert the half-life to hours, we can divide by the number of seconds in an hour (3600 seconds):
$t_{1/2} = \frac{0.693}{1.8
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