Question

Which of the following best represents the mole tion of ethylene glycol in an aqueous solution that contains 28% ethylene glycol by mass?

A) 0.28
B) 0.72
C) 0.20
D) 0.82

Answer 1

To determine the mole fraction of ethylene glycol, we use the mole ratio of ethylene glycol to the total moles in the solution, not the mass percentage.

Step-by-step explanation:

The question is asking us to calculate the mole fraction of ethylene glycol in an aqueous solution with a specific mass percentage. Mole fraction is a dimensionless property, calculated as the ratio of moles of solute to the total moles of solute and solvent. To derive the mole fraction for ethylene glycol, we need to know the moles of both ethylene glycol and water in the solution. From the information given in the references, we can conclude that for a similar solution with different concentration we calculate the number of moles of ethylene glycol and then find the mole fraction. While the mass percentage gives us the concentration of the solution, it does not directly represent the mole fraction.