Sulfur dioxide and oxygen react reversibly. $\text{2SO}_2(g) + \text{O}_2(g) \rightleftharpoons \text{2SO}_3(g)$ $K_c = 280\,\text{mol}^{-1}\,\text{dm}^3$ at $1000\,\text{K}$ For an equilibrium mixture at $1000\,\text{K}$, the concentration of sulfur dioxide is $0.200\,\text{mol dm}^{-3}$ and that of oxygen is $0.100\,\text{mol dm}^{-3}$. Determine the concentration of sulfur trioxide.
- A$1.058\,\text{mol dm}^{-3}$
- B$1.120\,\text{mol dm}^{-3}$
- C$2.366\,\text{mol dm}^{-3}$
- D$5.600\,\text{mol dm}^{-3}$