Question

What is the mole fraction of glucose in $10$% w/w glucose solution?

• A. $0.01$
• B. $0.02$
• C. $0.03$
• D. $0.04$

Answer 1

The correct option is A $0.01$

Mole fraction = $\frac{\text{No. of moles of glucose}}{\text{No. of moles of solution}}$

Molecular mass of Glucose = $180g/mole$

No. of moles of Glucose = $\frac{10}{180}=0.0555$ moles

Molecular mass of water = $18g/mole$

No. of moles of water = $\frac{90}{18}=5$ moles

Mole fraction = $\frac{0.0555}{0.0555+5}$ = $0.01$ moles

Hence, option $A$ is correct.