7 kg of each of water and acetic acid are mixed. The freezing point of the solution will be -x^° C. Consider the acetic acid does not dimerise in…

$\displaystyle 7$ kg of each of water and acetic acid are mixed. The freezing point of the solution will be $\displaystyle -x^{\circ} \mathrm{C}$. Consider the acetic acid does not dimerise in water, nor dissociates in water. $\displaystyle x=$ $\displaystyle \_\_\_\_$ (nearest integer) [Given: Molar mass of water $\displaystyle =18 \mathrm{~g} \mathrm{~mol}^{-1}$, acetic acid $\displaystyle =60 \mathrm{~g} \mathrm{~mol}^{-1}$ $\displaystyle \mathrm{K}_{\mathrm{f}} \mathrm{H}_2 \mathrm{O}: 1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ $\displaystyle \mathrm{K}_{\mathrm{f}}$ acetic acid: $\displaystyle 3.90 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ freezing point: $\displaystyle \mathrm{H}_2 \mathrm{O}=273 \mathrm{~K}$, acetic acid $\displaystyle =290 \mathrm{~K}$ ]