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18 g of glucose (C6H(12)O(6)) is added t...

18 g of glucose `(C_6H_(12)O_(6))` is added to 178.2g of water. The vapour pressure of water for this aqueous solution at `100^@C` is

A

`767.6` mm Hg

B

760 mm Hg

C

`752.4` mm Hg

D

`725.4` mm Hg

Text Solution

Verified by Experts

The correct Answer is:
B
Vapour pressure `(p^(@))` of pure water at `100^(@)C` is = 760 mm Hg
From relative lowering of vapour pressure
`(p^(@)-p_(s))/(p^(@))=w_(2)/(m_(2))xxm_(1)/(w_(1))`
`(760-p_(s))/(760)=18/(180)xx18/(178.2)=1/(99)`
`760-p_(s)=760/(99)`
or `760-p_(s)=7.6`
`rArrp_(s)=752.4` mm Hg
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