What is the molarity of a solution in which 3.0 moles of sodium chloride is dissolved in 1500 mL of water? please show work

The density of the solid phase of a substance is 0.90 g/cm3 and the density of the liquid phase is 1.0 g/cm3. a large increase in pressure will a. lower the freezing point b. raise the freezing point c. lower the boiling point d. raise the triple point e. lower the triple point