The degree of dissociation of `Ca(NO_(3))_(2)` in a dilute aqueous solution, containing `7.0 g` of the salt per `100 g` of water at `100^(@)C` is `70%`. If the vapour pressure of water at `100^(@)C` is `760 mm`, calculate the vapour pressure of the solution.

Answer

`746.10mm`

Explanation

`P_(s)P^(@) xx X_("solvent")`
`= 760 xx (((100-7)/(18)))/([5.167 +(7)/(164)(1+2xx0.7)])`
`=760 xx (5.167)/(5.167 +0.102)`
`= 760 xx (5.167)/(5.269) = 760 xx 0.98 = 745.3 mm`