Ethylene glycol is used in commerical antifreezes. Ethylene glycol is added to water in a vehicle's radiator to lower the freezing point and prevent the water in the radiator from freezing. Caculate the freezing point of a solution of $126$ g of ethylene glycol in $642$ g of water. Water freezes at $0\mathrm{.}00$ degrees celsius and has a freezing point depression constant $($kf$)$ of $1\mathrm{.}86$ degrees celsius $/$ m