Question

The molality of a solution having $18g$ of glucose $(mol.wt.=180)$ dissolved in $500g$ of water is

• A. $0.2M$
• B. $0.1M$
• C. $2.2M$
• D. $0.5M$

Answer 1

Answer: (A)

Moles of glucose $=\frac{\text{Mass}}{\text{Molecular mass}}=\frac{18}{180}$
$\Rightarrow$ Molality $=\frac{0.1}{500}\times 1000$
$=0.2M$