Question

Ethylene glycol is used as an antifreeze for water in car radiator.how much ethylene glycol should be added to one kg of water to prevent it from freezing at -10C

Answer 1

Dear Student,

$$\begin{gathered} ∆{\mathrm{T}}_{\mathrm{f}}={\mathrm{K}}_{\mathrm{f}}\mathrm{m} \\ ={\mathrm{K}}_{\mathrm{f}}\frac{{\displaystyle \frac{{\mathrm{m}}_2}{{\mathrm{M}}_2}}}{{\mathrm{m}}_1} \\ \mathrm{or},{\mathrm{m}}_2=\frac{∆{\mathrm{T}}_{\mathrm{f}}{\mathrm{m}}_1{\mathrm{M}}_2}{{\mathrm{K}}_{\mathrm{f}}}=\frac{(10°\mathrm{C})(1\mathrm{kg})(62{\mathrm{gmol}}^{-1})}{(1.86°{\mathrm{Ckgmol}}^{-1})}=333.3\mathrm{g} \end{gathered}$$