The observed freezing point depression of a 0.01 m aqueous solution of a weak acid HA is 0.0205 °C. If the $K_f$ of water is 1.86 K kg/mol, which expression correctly calculates the percent ionization of the weak acid?

The osmatic pressure of a 5% (wt./vol) solution of cane sugar at $150^\circ C$ is

Insulin ${\left( {{{\rm{C}}_2}{{\rm{H}}_{10}}{{\rm{O}}_5}} \right)_n}$ is dissolved in a suitable solvent and the osmotic pressure $\left( {\rm{\pi }} \right)$ of solutions of various concentrations $C\left( {{\rm{g}}/{\rm{c}}{{\rm{m}}^3}} \right)$ is measured at $20^\circ C$. the slope of a plot of ${\rm{\pi }}$ against $C$ is formed to be $4.65 imes {10^{ - 3}}$. The molecular weight of the insulin is :