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The vapour pressure of pure water at 25@...

The vapour pressure of pure water at `25@ C` is `23.00` torr. What is the vapour pressure of `100 g`of water to which `100 g` of `C_(6)H_(12)O_(6)` (glucose) has been added ?

Text Solution

Verified by Experts

Raoult's law : `P_("solution")=p_(A)=p_(A)@chi_(A)`
`rArr P_("solution") =p_(A)@(n_(A))/(n_(A) + n_(B))= p_(A)@ ((W_(A))/(Mw_(A)))/((W_(A))/(Mw_(A))+(W_(B))/(Mw_(B))`
`rArr 23.00 xx (100/18)/(100/18+100/180)`
`[Mw_("Glucose") =180 g mol^(-1),p_(A)@ = 23.0 "torr"]`
`rArr p_("solution")= 21294` torr
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