Four aqueous solutions are each $0.1 m$ : glucose, urea, $NaCl$ and $CaCl X_{2}$ . Assuming complete dissociation of the electrolytes, which has the lowest vapour pressure at a given temperature?

Answer: D

Vapour pressure lowering depends on the number of solute particles. Particles per formula unit are: glucose 1, urea 1,

NaCl

2 and

CaCl X_{2}

3. The most particles give the largest lowering, so

CaCl X_{2}

has the lowest vapour pressure.

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