Calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is `0.040`.

Explanation

To calculate the molarity of a solution of ethanol in water where the mole fraction of ethanol is 0.040, we can follow these steps:

### Step 1: Understand the definition of mole fraction
The mole fraction (X) of a component in a solution is defined as the ratio of the number of moles of that component to the total number of moles of all components in the solution.

### Step 2: Set up the equation for mole fraction
Let \( n \) be the number of moles of ethanol. The mole fraction of ethanol (X_ethanol) is given by the formula:
\[
...