C2h6o2 is infinitely miscible(soluble) in water. ethylene glycol is a nonelectrolyte that is used as antifreeze. what is the lowest possible melting point for engine coolant that is 30% ethylene glycol? the kf for h20 is 1.86 c/m. expert answer 100% (7 ratings) previous question next question get more from chegg

-12.85 °C is the lowest possible melting point for engine coolant that is 30% ethylene glycol.

Explanation:

where,

=depression in boiling point

i = van't Hoff factor = 1 (organic compounds)

Mass of ethylene glycol = 30 % of 100 g solution :

=

Mass of water=100 g - 30 g = 70 g = 0.070 kg (1 kg = 1000 g)

= freezing point constant = 1.86 °C/m

m = molality

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

Freezing pint of pure water = T = 0°C

Freezing point of 30 % ethylene glycol solution =

-12.85 °C is the lowest possible melting point for engine coolant that is 30% ethylene glycol.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

c. electrical charges of ionic bonds.