Where is the subscript found in a chemical formula?

Amount of liquid measured in l or lm

C3h8o3 - glycerol major species present when dissolved in water

Asolution is made by dissolving 2.3 moles of sodium chloride (nacl) in 0.155 kilograms of water. if the molal boiling point constant for water (kb) is 0.51 °c/m, what would be the boiling point of this solution? show all the steps taken to solve this problem.