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,

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.