a. Vapour pressure of water at 293K is 17.535 mmHg. Calculate the vapour pressure of water at 293K, when 25g of glucose is dissolved in 450g of water.

**OR**

b. The boiling point of benzene is 353.23K when 1.80g of non-volatile solute was dissolved in 90g of benzene, the boilin

Question

a. Vapour pressure of water at 293K is 17.535 mmHg. Calculate the vapour pressure of water at 293K, when 25g of glucose is dissolved in 450g of water.

**OR**

b. The boiling point of benzene is 353.23K when 1.80g of non-volatile solute was dissolved in 90g of benzene, the boiling point is raised to 354.11K. Calculate the molar mass of the solute. Kb for benzene is 2.53Kkgmol$^{-1}$.

Accepted Answer

> [!TLDR]
> Computing mole fraction of glucose and applying Raoult's law of relative lowering of vapour pressure gives a solution vapour pressure of about 17.44 mmHg (down from 17.535 mmHg for pure water).
> …

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