Q.

Estimate the lowering of vapour pressure due to the solute (glucose) in a 1.0 M aqueous solution at 100oC

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10 torr

18 torr

13.45 torr

24 torr

answer is C.

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Detailed Solution

Normal boiling point of water is 100oC, henceP∘H2O=760 torr; MH2O=18g/molm=P∘−PP×1000MH2O⇒P=746.5; ΔP=13.45 torr

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