The mole fraction of a solute in a 2.0 molal aqueous solution is approximately:

In 2.0 molal solution, moles of solute = 2.0 moles, moles of water = \( 1000 / 18 = 55.56\text{ moles} \). Total moles = \( 55.56 + 2.0 = 57.56 \). Mole fraction \( x_2 = \frac{2.0}{57.56} = 0.0347 \approx 0.035 \).