Ethylene glycol, c2h6o2, is a nonvolatile substance unable to form ions in water. if 38.6 grams of ethylene glycol is dissolved in 175 grams of water, what is the freezing point of the solution? kf = 1.86°c/m; kb = 0.512°c/m

-6.61°c

1.82°c

6.61°c

-1.82°c

Answer : The freezing point of the solution is,

Explanation :  Given,

Mass of ethylene glycol = 38.6 g

Mass of water = 175 g

Molar mass of ethylene glycol = 62.07 g/mole

Formula used :  

where,

= change in freezing point

= temperature of pure water =

= temperature of solution = ?

i = Van't Hoff factor for non-electrolyte solution = 1

= freezing point constant =

m = molality

Now put all the given values in this formula, we get

Therefore, the freezing point of the solution is,

your answer would be a. 12.5 kg