For this question, assume that $(\text{NH}_4)_2\text{CO}_3·\text{H}_2\text{O}(s)$ dissolves in water with no change in volume. What mass of $(\text{NH}_4)_2\text{CO}_3·\text{H}_2\text{O}(s)$ must be added to $800\,\text{cm}^3$ of water to produce a $0.100\,\text{mol dm}^{-3}$ solution of $\text{NH}_4^+$ ions?
- A$4.56\,\text{g}$
- B$7.13\,\text{g}$
- C$9.12\,\text{g}$
- D$14.3\,\text{g}$