Question

Calculate the molality if 2.5 g of glucose is dissolved in 75 g of benzene.

• A.
  0.185 m
• B.
  0.0185 m
• C.
  1.85 m
• D.
  0.0925 m

Answer 1

The correct option is A

0.185 m
$\text{Molality}=\frac{\text{Moles of solute}}{\text{Mass of solvent}}=\frac{2.5/180}{75/1000}=\frac{2.5}{180}\times \frac{1000}{75}=0.185m$