naphtalene sublimes easily, but potassium bromide does not. how could you separarte these two substances?

Answer 1

Put the mixture in a flask that can be evacuated with some sort of cold finger set-up. Evacuate the flask and mildly heat, and the napthalene will sublime and crystallize onto the cold finger.

You can also use water to separate them, as napthalene is not water soluble.