The reaction of sulfur dioxide with oxygen is reversible. $\text{2SO}_2(g) + \text{O}_2(g) \rightleftharpoons \text{2SO}_3(g)$ $K_c = 280\ \text{mol}^{-1}\ \text{dm}^3$ 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 the concentration 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$5.600\ \text{mol dm}^{-3}$