Pure CS2 melts at -112oC. 228grams of propylene glycol crystals is mixed with 500grams of \(CS2.\;\; If\;\; K_f\;\; of\;\; CS_2=-3.83kgKmol^{-1},\) what is the depression in freezing point?
\( -23^o C\)
\( -100^o C\)
\( -20^o C\)
\( -135^o C\)
