Q.

The vapour pressure of water at 20oC is 17.5 mmHg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20oC, the vapour pressure of the resulting solution will be:

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a

17.675 mmHg

b

15.750 mmHg

c

16.500 mmHg

d

17.325 mmHg

answer is A.

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Detailed Solution

Po-PSPS=wglu×MH2omglu×WH2o17.5-PSPS=18×18180×178.217.5-PSPS=0.01PS=17.676 mmHg.
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