Based upon the technique of reverse osmosis the approximate pressure required to desalinate sea water containing 2.5% (mass/volume)`KNO_(3)` at `27^(@)`C will be

Assuming the same pressure in each case calculate the mass of hydrogen required to inflate a balloon to a certain volume V at 100^(@)C if 3.5 g helium is required to inflate the balloon to half the volume V at 25^(@)C .

Assuming the same pressure in each case, calculate the mass of hydrogen required to inflate a balloon to a certain volume at 100^(@)C if 3.5 g He is required to inflate the balloon to half the volume at 25^(@)C .

Assuming the same pressure in each case calculate the mass of hydrogen requied to inflate a ballon to a certain volume V at 100^(@)C if 3.5 g helium is required to inflate the balloon to half the volume V at 25^(@)C .

Urea forms an ideal solution in water. Determine the vapour pressure of an aqueous solution containing 10% by mass of urea at 40^@C .[Vapour pressure of water at 40^@C = 55.3mm of Hg ]