Answer
$8.25\ h$
Work Step by Step
First order process: $ln([SO_2Cl_2]/[SO_2Cl_2]_0)=-kt$
$ln(0.00031/0.00124)=-2.8\times10^{-3}min^{-1}\times t\rightarrow t=495.1\ min=8.25\ h$
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