When magnesium carbonate is heated, it breaks down to produce magnesium oxide and carbon dioxide, as shown. $\text{MgCO}_3 \rightarrow \text{MgO} + \text{CO}_2$ What mass of magnesium carbonate is required to produce $5.0\,\text{g}$ of magnesium oxide?
- A$3.5\,\text{g}$
- B$4.0\,\text{g}$
- C$6.5\,\text{g}$
- D$10.5\,\text{g}$