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Q.

The vapour pressure of water at 20° C is 17.54 mm Hg. What will be the vapour pressure of the water in the apparatus shown after the piston is lowered, decreasing the volume of the gas above the liquid to one half of its initial volume (assume temperature constant)?

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a

Between 8.77 and 17.54 mm Hg 

b

8. 77 mm Hg

c

17.54 mm Hg

d

35.08 mm Hg

answer is B.

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Detailed Solution

Vapor pressure depends on the solvent and its temperature. 

Container's liquid is in equilibrium with the vapor if the volume remain constant.

Thus, vapour pressure of the water in the apparatus will be 17.54 mm Hg.

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