Calcium chloride when dissolved in water dissociates into its ions according to the following equation. CaCl2 (aq) → Ca2 + (aq) + 2Cl- (aq) Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.

Answer: 3.6132 × 1024 ions

1 mole of calcium chloride (CaCl2) = 111g

∴ 222g of CaCl2 is equivalent to 2 moles of CaCl2

Since 1 formula unit CaCl2 gives 3 ions.

1 mol of CaCl2 will give 3 moles of ions

2 moles of CaCl2 would give 3 × 2 = 6 moles of ions.

Number of ions = Number of moles of ions × Avogadro number

Number of ions = 6 × 6.022 ×1023

Number of ions = 36.132×1023

Number of ions = 3.6132 × 1024 ions

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