The vapour pressure of pure water at 26^...

The vapour pressure of pure water at `26^(@)"C"` is 25.21 torr. What is the vapour pressure of a solution which contains 20.0 g glucose,`"C"_(6)"H"_(12)"O"_(6)`, in 70 g water?

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The correct Answer is:

24.5 torr

Glucose-B, water-A
`(P_(A)^(0)-P_(sol))/(P_(A)^(0))=(W_(B)xxm_(A))/(m_(B)xxw_(A))`
`(25.21-P_(sol))/25.21=(20xx18)/(180xx70)`
`P_(sol)=24.5 " torr"`

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