When 25.0 g of hydrated copper(II) sulfate crystals are heated, anhydrous copper(II) sulfate and water vapour are produced. $\text{CuSO}_4\cdot5\text{H}_2\text{O}(s) \rightarrow \text{CuSO}_4(s) + 5\text{H}_2\text{O}(g)$ Determine the mass of anhydrous copper(II) sulfate formed. [$M_r$: $\text{CuSO}_4$, $160$; $\text{H}_2\text{O}$, $18$]
- A9.0 g
- B16.0 g
- C22.5 g
- D25.0 g