What is the definition of molarity in the context of solution concentrations?

Calculate the molarity of a solution containing 0.5 moles of NaCl in 2 liters of water.

Calculate the molality of a solution containing 0.2 moles of KCl in 0.5 kg of water.

Which of the following is a colligative property relevant to solution concentrations?

Which statement correctly evaluates the differences between molarity and molality?