The vapour pressure in mm of Hg, of an aqueous solution obtained by adding 18 g of glucose `(C_(6)H_(12)O_(6))` to 180 g of water at `100^(@)C` is

Options

A. `7.60`
B. `76.0`
C. 759
D. `752.4`

Answer

(d)

Explanation

`(p_(o)-P(s))/(P_(o))=(n_(2))/(n_(1)+n_(2))=(w_(2)/m_(2))/(w_(1)/(m_(1))+(w_(2))/m_(2))`
= `(18/180)/(180/(18)+(18)/(180))=(0.1)/(10+0.1)`
`(P_(o)-p_(s))/(p_(o))=(0.1)/(10.1)` `rArr ``(P_(o)-p_(s))10.1P_(s)` `therefore` `P_(s)=(10xx760)/(10.1)(because P_(o)=760mm of Hg)`
= `752.4` mm of `Hg`