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18g glucose (C(6)H(12)O(6)) is added to ...

`18g` glucose `(C_(6)H_(12)O_(6))` is added to `178.2g` water. The vapour pressure of water (in torr) for this aqueous solution is:

A

`759.0`

B

`7.6`

C

`76.0`

D

`752.4`

Text Solution

Verified by Experts

The correct Answer is:
D
Assuming temperature to be `100^(@)C`
Relative lowering of vapour pressure
Equation `(P^(@)-P^(s))/(P^(@)) = X_("solute") = (n)/(n+N)`
Modified forms of equation is `(P^(@)-P_(s))/(P_(s)) = (n)/(N)`
`P^(@) = 760` torr
`P_(S) = ?`
`(760 -P_(s))/(P_(s)) = (18//180)/(178.2//18)`
`P_(S) = 752.4` torr
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