What is the numerical value of osmotic pressure of $1 \ M$ urea solution if the numerical value of osmotic pressure of $0.5 \ M$ urea solution is $x$?

The osmotic pressure of solutions of $PVC$ in cyclohexanone at $300 \ K$ are plotted on the graph. The molar mass of $PVC$ is $........ \ g \ mol^{-1}$ (Nearest integer) (Given : $R = 0.083 \ L \ atm \ K^{-1} \ mol^{-1}$ )

$A$ solution of $12 \ g$ of non-electrolyte $(A)$ prepared by dissolving it in $1000 \ mL$ of water exerts the same osmotic pressure as that of a $0.05 \ M$ glucose solution at the same temperature. The empirical formula of $A$ is $CH_2O$. The molecular mass of $A$ is $.......... \ g \ mol^{-1}$. (Nearest integer)

If $250 \ cm^3$ of an aqueous solution containing $0.73 \ g$ of a protein $A$ is isotonic with one litre of another aqueous solution containing $1.65 \ g$ of a protein $B,$ at $298 \ K,$ the ratio of the molecular masses of $A$ and $B$ is..........$\times 10^{-2}$ (to the nearest integer).

Which of the following pairs of solutions can be isotonic at the same temperature?

$18 \ g$ glucose (Molar mass $= 180 \ g/mol$) is dissolved in $100 \ mL$ of water at $300 \ K$. If $R = 0.0821 \ L \ atm \ K^{-1} \ mol^{-1}$,what is the osmotic pressure of the solution (in $atm$)?