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

746.24 mm/Hg

Explanation

`("P"_("solvent")^(0)-"P"_("solution"))/("P"_("solution"))=[1+("n"-1)alpha]("w"_("solute")xx"m"_("solvent"))/("m"_("solute")xx"w"_("solvent"))" "(("P"_("s")^(0)-"P"_("s"))/("P"_("s"))=("in"_("B"))/("n"_("A")))`
`(760-"P"_("solution"))/("P"_("solution"))=[1+(3-1)0.70]xx(7xx18)/(164xx100)`
`"P"_("solution")=746.2"mm of Hg"`