## Chemistry (4th Edition)

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