The vapor pressure of water at 20c is 17.5 mmhg

Asked by admin @ 05/08/2021 in Chemistry viewed by 287 People

The vapour pressure of water at 20° C is 17.5 mm Hg. If 18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water at 20° C, the vapour pressure of the resulting solution will be (a) 17.325 mm Hg (b) 15.750 mm Hg(c) 16.500 mm Hg (d) 17.500 mm Hg

Answered by admin @ 05/08/2021

(a) : In solution containing nonvolatile solute,pressure is directly proportional to its mole fraction.

Psolution = vapour pressure of its pure component × mole fraction in solution

Psolution = 17.32.

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