Osmotic pressure seawater has a salinity of 3.5% meaning that if you boil away a kilogram of seawater, there will be 35g of solids (mostly nacl). when dissolved, the sodium chloride dissociates into separate na+ and clions. a) calculate the osmotic pressure difference between seawater and fresh water. for simplicity, assume that all the dissolved salts in seawater are nacl. b) reverse osmosis occurs when you apply a pressure difference greater than the osmotic pressure to a solution separated from a pure solvent by a membrane permeable only to the solvent. in this process, the solvent flows out of the solution and this can be used to desalinate sea water. use your result from part (a) to find the minimum work required to desalinate one liter of water. c) it is also possible to desalinate water by evaporation. the water vapor is recondensed and the salt is left behind. compare your result from part (b) with the amount of heat that would be required to evaporate a liter of water. assume that the water starts at a temperature of 300 k and the latent heat of vaporization at a pressure of one atmosphere is 40.7 kj/mol. compare your result with that of part (b).