The Data Booklet is required for this question. When heated, anhydrous magnesium nitrate, $\text{Mg(NO}_3)_2$, decomposes to form a white solid and a mixture of two gases X and Y. Y is oxygen. What is the ratio $\dfrac{\text{mass of X formed}}{\text{mass of Y formed}}$?
- A$\dfrac{1}{0.174}$
- B$\dfrac{1}{0.267}$
- C$\dfrac{1}{0.348}$
- D$\dfrac{1}{3.43}$