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

`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 :

A

76-0

B

752.4

C

759-0

D

7.6

Text Solution

Verified by Experts

The correct Answer is:
b
According to Raoults's Law
`(P_(A)^(@)-P_(S))/P_(S)=X_(B)=W_(B)/M_(B)xxM_(A)/M_(A)`
`P_(A)^(@)/P_(S)-1=((18g))/((180g mol^(-1)))xx((18g mol^(-1)))/((178.2g mol^(-1)))=0.01`
`P_(A)^(@)/P_(S)=1+0.01=1.01`
`((760"torr"))/P_(S)=1.01or P_(S)=("760torr")/(1.01)=7524"torr"`
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