question_answer

  Calcium chloride when dissolved in water dissociates into its ions according to the following equation. Calculate the number of ions obtained from  when 222 g of it is dissolved in water.

Answer:

                1 mole of calcium chloride = 111 g 222 g of is equivalent to 2 moles of Since 1 formula unit  gives 3 ions, therefore, 1 mole of will give 3 moles of ions. 2 moles of  would give 3x2=6 moles of ions. Number of ions = Number of moles of ions x Avogadro number = 6 x 6.022 x 1023 = 36.132 x 1023 = 3.6132 x 1024 ions.