Calculate the mole fraction of ethylene glycol `(C_(2)H_(6)O_(2))`
in a solution containing `20%` of `C_(2)H_(6)O_(2)` by mass.

Explanation

To calculate the mole fraction of ethylene glycol (C₂H₆O₂) in a solution containing 20% by mass of C₂H₆O₂, we will follow these steps:

### Step 1: Determine the mass of ethylene glycol and water in the solution
Given that the solution is 20% C₂H₆O₂ by mass, we can assume we have 100 g of the solution. Therefore:
- Mass of C₂H₆O₂ (ethylene glycol) = 20 g
- Mass of water = 100 g - 20 g = 80 g

### Step 2: Calculate the molar mass of ethylene glycol (C₂H₆O₂)
...