1.

18 g of glucose (C_(6)H_(12)O_(6)) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100^(@)C is :

Answer»

7.60 torr
76.00 torr
752.40 torr
759.00 torr

Solution :`(p^(@)-p)/(p^(@))=x`(solute)
`p^(@)`, vapour PRESSURE of pure WATER at `100^(@)C`
`=760` torr
`x=((18)/(180))/((18)/(180)+(178*2)/(18))=(0*1)/(0*1+9*9)=(0*1)/(10)`
`:.(0*1)/(10)=(760-p)/(760)`
Solving `p=752*4` torr.


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