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The gas phase decomposition of sulfuryl chloride at $600K$

$S{O}_{2}C{l}_2(g)S{O}_2(g)+C{l}_2(g)$

is first order in $S{O}_{2}C{l}_2$ with a rate constant of $2\mathrm{.}80{10}^{-3}$min$-1.$

If the initial concentration of $S{O}_{2}C{l}_2$ is $0\mathrm{.}00205M,$ the concentration of $S{O}_{2}C{l}_2$ will be $0\mathrm{.}000531M$ after min have passed.