Answer
0.037 M
Work Step by Step
We use the equation for $K_c$ to find:
$\frac{[SO_{3}]^{2}}{[SO_{2}]^{2}[O_{2}]} = K_{c}$
$[SO_{3}]=(2.8×10^{2}×0.0124^{2}×0.031)^{1/2}$ = 0.037 M
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