why do napthalene balls disappear after some time ?
napthalene has a property to sublime. these balls turn into vapour because the intermolecular force is very weak.
because it directly change into gas
AS NAPHTHALENE BALLS HAV THE TENDENCY OF SUBLIMING WEN EXPOSED TO ATMOSPHERE THEY DISAPPEAR AFTER SUM TYM.
This is due to the property of sublimation. Some solids do not exist in their liquid form; instead they directly evaporate from their vapour forms. Naphthalene is among those solids that show the property of sublimation.So naphthalene balls disappear after some time due to the property of sublimation.