Estimate the freezing point of aqueous solutions containing

a$)4\mathrm{.}85g$ of galactose $($nonelectrolyte$)$

b$)3\mathrm{.}03g$ of potassium iodide $($strong electrolyte$)$

c$)2\mathrm{.}13g$ of magnesium chloride $($strong electrolyte$)$

Briefly explain why a solution does not have a constant freezing point.

Calculate the molar mass of an unknown substance if the freezing point of a solution containing $2\mathrm{.}00g$ of the substance in $100g$ of phenol is $40\mathrm{.}53C($freezing point of phenol $=40\mathrm{.}89C).$