A student completely reacts $1$ mol of magnesium powder with oxygen in a sealed container of volume $0.030\,\text{m}^3$, where the oxygen is at a pressure of $2.0 \times 10^5\,\text{Pa}$ and a temperature of $600\,\text{K}$. The magnesium reacts completely to form $\text{MgO}$. What percentage of the oxygen is consumed?
- A$5.0\%$
- B$10\%$
- C$42\%$
- D$83\%$