Osmolarity = i x
Molarity        i = Van't
Hoff factor
  i = Van't Hoff factor for NaCl = 2
Hence,
For NaCl , Osmolarity = 2 x Molarity Â
Molarity of NaCl = ( mass / molar mass) x (1/volume of solution
in Litres)
                         Â
= ( 5.00 g / 58.44 g/mol) x (1/0.1 L)
                          Â
= 0.855 M
Molarity of NaCl = 0.855 M
Osmolarity = 2 x Molarity Â
                 Â
= 2 x 0.855 M
                  Â
= 1.71 osmol/L
