Calcium chloride (CaCl2) is a salt which dissociates when dissolved in water. Assuming that the dissociation is complete (100 %), then the half reaction for this would be:
CaCl2 ---> Ca2+ + 2 Cl-
We can see that in 1 mole of CaCl2 salt, 1 mole of Ca2+ ion and 2 moles of Cl- ion is created. Therefore there are 3 moles of ion per 1 mole of CaCl2. Using this ratio, the total number of moles of ions in the solution is:
Total number of ions = 0.5 mol CaCl2 * (3 moles ion / 1 mol CaCl2)
Total number of ions = 1.5 moles ion
