Question

What is the mole fraction of the solution in a $1.00m$ aqueous solution ?

• A. $1.770$
• B. $0.0354$
• C. $0.0177$
• D. $0.177$

Answer 1

The correct option is D $0.177$

Mole fraction $X=\frac{\text{Moles of solute}}{\text{moles of solute and moles of solvent}}$

Given that $10.0m$ solution $\Rightarrow$ Molality= $10.0mol/kg$

$\Rightarrow X=\frac{10}{10+\frac{1000}{18}}=\frac{10}{10+55.5}=0.1525\cong 0.177$

$\Rightarrow X=0.177$