Question

Mole fraction of the solute in a 1.00 molal aqueous solution is:

• A. 1.77
• B. 0.177
• C. 0.0177
• D. 0.0344

Answer 1

The correct option is C 0.0177

1.00 molal solution means 1 mole of solute in 1 kg (or 1000 g) of water.

Number of moles of solute $=1$

Number of moles of solvent $=\frac{1000}{18}=55.55$

Mole fraction of Solute $=\frac{1}{1+55.55}=0.01768$

Hence, the correct option is $C$