$\begin{aligned} & \mathrm{A}_2(\mathrm{~g})+\mathrm{B}_2(\mathrm{~g}) \mathrm{f} \quad \mathrm{C}(\mathrm{g}) ; \mathrm{K}_{\mathrm{eq}}=2.7 \times 10^{-5} \\ & \frac{1}{3} \mathrm{~A}_2(\mathrm{~g})+\frac{1}{3} \mathrm{~B}_2(\mathrm{~g}) \mathrm{f} \quad \frac{1}{3} \mathrm{C}(\mathrm{g}) ; \mathrm{K}_{\mathrm{eq}}^1=\left(\mathrm{K}_{\mathrm{eq}}\right)^{1 / 3} \\ & \mathrm{~K}_{\mathrm{eq}}^1=\left(2.7 \times 10^{-5}\right)^{1 / 3} \\ & =3 \times 10^{-2}\end{aligned}$