1.

Formation of a solution from two componenets can be considered as : (i) pure sovent rarr separated solvent molecules, /_\H_(1) (ii) Pure solute rarrseparated molecules,/_\H_(2)(iii) separated sovent andsolute moleculesrarrsolution, /_\H_(3) solution so formed will be ideal if :

Answer»

`DeltaH_("SOLN") = DeltaH_(3)- DeltaH_(1)-DeltaH_(2)`
`DeltaH_("soln") = DeltaH_(1) +DeltaH_(2)+DeltaH_(3)`
`DeltaH_("soln") = DeltaH_(1) +DeltaH_(2)-DeltaH_(3)`
`DeltaH_("soln") = DeltaH_(1)-DeltaH_(2)-DeltaH_(3)`

Solution :According to HESS' law
`DeltaH_("soln") = DeltaH_(1) +DeltaH_(2) + DeltaH_(3)`.


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