What is the osmotic pressure of a semi-molar solution at $27^{\circ} C$ (in $atm$)?
$(R = 0.082 \ L \ atm \ K^{-1} \ mol^{-1})$

How can you remove the hard calcium carbonate layer of the egg without damaging its semipermeable membrane? Can this egg be inserted into a bottle with a narrow neck without distorting its shape? Explain the process involved.

Osmotic pressure is $0.0821 \ atm$ at a temperature of $300 \ K$. Find the concentration in $mol/L$.

If a solution has an osmotic pressure of $0.82 \ bar$ at $27 \ ^oC$,find the concentration of such a solution. (in $M$)

Which solution is isotonic with $6 \% \ w/v$ aqueous solution of urea (in $M \ NaCl$)? [Molar mass of Urea $= 60 \ g \ mol^{-1}$]

Which inorganic precipitate acts as a semipermeable membrane,or what is the chemical composition of a semipermeable membrane?