A solution of aluminium chloride (Mr=133.5M_{\text{r}} = 133.5Mr=133.5) contains 2.67 g of AlCl3\text{AlCl}_3AlCl3 in 250 cm3 of solution. In this solution, the aluminium chloride is fully dissociated into ions.
What is the concentration of chloride ions in this solution?
8.00×10−2 mol dm−38.00 \times 10^{-2}\text{ mol dm}^{-3}8.00×10−2 mol dm−3
1.60×10−1 mol dm−31.60 \times 10^{-1}\text{ mol dm}^{-3}1.60×10−1 mol dm−3
2.40×10−1 mol dm−32.40 \times 10^{-1}\text{ mol dm}^{-3}2.40×10−1 mol dm−3
2.67×10−2 mol dm−32.67 \times 10^{-2}\text{ mol dm}^{-3}2.67×10−2 mol dm−3