The coolant in automobiles is often a 50/50 % by volume mixture of ethylene glycol, c2h6o2, and water. at 20°c, the density of ethylene glycol is 1.1088 g/ml and the density of water is 0.9982 g/ml. what is the expected freezing point of a 50/50(v/v)% ethylene glycol/water solution? kf = 1.86°c/m for water.

Explanation:

Let the volume of the solution be 100 ml.

As the volume of glycol = 50 = volume of water

Hence, the number of moles of glycol =

                                                  =

                         =

                         = 0.894 mol

Hence, number of moles of water =

                                             = 2.77

As glycol is dissolved in water.

So, the molality =

                           = 17.9

Therefore, the expected freezing point =

                                                                  =

Thus, we can conclude that the expected freezing point is .

u i forgot the answer?

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.