Information from the Data Booklet may be needed for this question. When magnesium nitrate, $\text{Mg(NO}_3)_2$, is heated, it decomposes to form a white solid and a mixture of gases; oxygen is one of the gases given off. A sample of $29.7\ \text{g}$ of anhydrous magnesium nitrate is heated until the reaction is complete. What mass of oxygen is formed?
- A$3.2\ \text{g}$
- B$6.4\ \text{g}$
- C$12.8\ \text{g}$
- D$19.2\ \text{g}$