What is the osmolarity of a solution made by dissolving 0.50 mole of the strong electrolyte cacl2 in 1.0 l of solution?

Osmolarity=osmole of the solute/litres of the solution

ionic equation for dissociation of CaCl2 is

CaCl2--->Ca2 + + 2Cl-

total osmoles for reaction are 1 (Ca2+) + 2 (Cl-) = 3 osmoles

therefore

0.50 moles of CaCl2 x 3 osmoles / 1mole of CaCl2 = 1.5osmoles

osmolarity=1.5 / 1.0 L=1.5 osmol/l