Answer
$K=279.1$
Work Step by Step
The equilibrium constant is given by:
$K=[SO_3]^2/[SO_2]^2[O_2]$
$K=(4.13\times10^{-3}\ M)^2/(3.77\times10^{-3}\ M)^2(4.30\times10^{-3}\ M)$
$K=279.1$
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