<prompt> Osmotic pressure of 1 mol of idea solute relative to pure water is:6.5 atm.22.4 atm.4 atm.2 atm.  <response>: B i.e. 22.4 1 mol of an ideal solute dissolved in 1 kg 1000 gm of water i.e. 1 molal or M solution at 1 atm pressure at 25degC yields a solution whose osmotic pressure relative to pure water is 22.4 atmQ. 