A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the mole fraction of ethanol in this solution? A)0.377 B)0.392 C)0.553 D)0.608 E)0.623

Question

Quizplus · Accepted Answer

To find the mole fraction of ethanol, we need to first find the moles of each component in the solution.

Moles of ethanol = mass of ethanol / molar mass of ethanol
= 553 g / 46.07 g/mol = 12.00 mol

Moles of water = mass of water / molar mass of water
= 335 g / 18.02 g/mol = 18.59 mol

The total number of moles in the solution is:

12.00 mol + 18.59 mol = 30.59 mol

The mole fraction of ethanol is then:

12.00 mol / 30.59 mol = 0.392

A Solution of Ethanol (C2H6O) in Water Is Sometimes Used

A Solution of Ethanol (C₂H₆O) in Water Is Sometimes Used