Molarity and Molality

How does one express concentration in molarity and molality?

Express the concentration of solutions in molality and molarity.

Why is it better to use molality in laboratory experiments than molarity?

Calculate the molarity of a 2 L solution prepared by dissolving 15 moles of glucose in enough water.

Calculate the molality of a solution prepared by dissolving 8 moles of rock salt in 20 kg of water.

Calculate the amount of sodium phosphate (Na3PO4), in moles, to be added to 30 kg water to form a 2.5 molal solution of aqueous Na3PO4.

Calculate the amount of potassium acetate (KCH3COO), in moles, to be added to enough water to produce 0.250 L of a 1.5 molar solution of aqueous KCH3COO.

Calculate the amount of benzoic acid (C6H5COOH, MM = 122.12 g/mol), in grams, needed to produce 500 mL of a 2.5 M solution of aqueous C6H5COOH.

Calculate the amount of potassium hydrogen phthalate (C8H5KO4, MM = 204.22 g/mol), in grams, needed to be dissolved in 500 g of water to produce a 1.5 m solution of aqueous C8H5KO4.

How will you convert molarity to molality? What conversion factor (or factors) do you need?