Identify solute and solvent

• Solute: ethyl alcohol = $1$ mole
• Solvent: water = $9$ moles

Calculate masses

• Mass of ethyl alcohol: $1 \times 46 = 46\,\text{g}$

• Mass of water: $9 \times 18 = 162\,\text{g}$

Calculate total mass of solution

$46 + 162 = 208\,\text{g}$

Use mass percent formula

$\text{Mass percent of solute} = \frac{\text{mass of solute}}{\text{mass of solution}} \times 100$

$= \frac{46}{208} \times 100$

$= 22.115\ldots\%$

Integer answer

$\boxed{22}$

Comparison with stored correct answer

• Derived answer = $22$
• Stored correct answer = $22$

Hence, the answer agrees.