Q20 of 26 Page 1

Vapour pressure of water at 20°C is 17.5 mm Hg. Calculate the vapour pressure of water at 20°C when 15g of glucose (molar mass= 180g/mol) is dissolved in 150g of water.

Given that, P˚H2O = 17.5 mm Hg



Substituting the values in the above equation we get,



 = -1


1 + =


=


PH2O =


Therefore, PH2O = 17.32 mm Hg


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