PLEASE HELP! PHYSICAL CHEM

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The measured osmotic pressure of seawater is 25 atm at 273K.

a.) What is the activity of water in seawater at 273 K? Take the partial molar volume of water in seawater to be 0.018 M-1.

b.) The vapor pressure of pure water at 273 K is 4.6 torr. What is the vapor pressure of water in seawater at this temperature?

c.) What temperature would you expect to find for seawater in equilibrium with the polar ice caps? The melting point of pure water at 1 atm pressure is 0o C, and Ä H fus may be taken as 5.86 kJ/mol, independent of temperature.

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