What will be the sign of `Delta_(sys)` (+ve or -ve) in the process of-(i) vaporisation of a liquid (ii) condensation of a vapour (iii) sublimisation of a solid.

Explanation

(i) In the vaporisation of a liquid (liquid`to`vapour), `DeltaS_("system")` is +ve. This is because a substance in its vapour state possesses greater entropy than its liquid state.
(ii) In the condensation of a vapour (vapour`to`liquid), `DeltaS_("system")` is -ve. this is because a substance has greater entropy in its vapour state than in its liquid state.
(iii) In the sublimation of a solid (solid`to`vapour), `DeltaS_("system")` is +ve. this is because a substance possesses greater entropy in its vapour state than in its solid state.