Question

weredAnswerQuestion 9Which solute, when dissolved in 1 kg H₂O, will give the solution with the highestboiling point?50 g glyoxal, HCOCHO50 g ethylene glycol, HOCH₂CH₂OH50 g glycerol, HOCH₂CHOHCH₂OH50 g hydroxyacetic acid, HOCH₂COOH

Answer 1

50 g glyoxal, HCOCHO

Step-by-step explanation

The lowest molar mass from the given option will give the solution with the highest boiling point.

ΔT = Keb x m

Molality = moles of solute / 1kg of solute

Moles of solute = mass / molar mass.

This implies that; as the molar mass decreases, the moles of solute will increase.

Also, as the moles of solute increase, it generates high molality.

That is; ΔT ↑ = Kf . m ↑

Therefore, if the molality is high, the difference between the temperatures will be high, so the boiling point of the solution will be higher.

Thus, the solute that will give the solution with the highest boiling point is 50 g glyoxal, HCOCHO