Calculate the mole fraction of water in a solution made by mixing 1.0 g of water and 2.0 g of ethyl alcohol (C₂H₅OH).

Question

Quizplus · Accepted Answer

First, we need to calculate the number of moles of water and ethyl alcohol using their molar masses:

Number of moles of water = 1.0 g / 18.015 g/mol = 0.0555 mol
Number of moles of ethyl alcohol = 2.0 g / 46.068 g/mol = 0.0434 mol

The total number of moles in the solution is therefore:

Total number of moles = 0.0555 mol + 0.0434 mol = 0.0989 mol

Now we can calculate the mole fraction of water:

Mole fraction of water = Number of moles of water / Total number of moles
Mole fraction of water = 0.0555 mol / 0.0989 mol = 0.560

Therefore, the answer is choice C, 0.56.

Calculate the Mole Fraction of Water in a Solution Made