The moth balls are mainly disappeared because of the process called sublimation. During sublimation, a solid on heating, converts directly into a vapor without passing through a intermediate liquid state. Moth balls are made up of naphthalene. Naphthalene has very weak intermolecular forces. Because of these forces the naphthalene sublimates and converts into vapor. Now this vapor is either absorbed by clothes or it escapes into atmosphere causing the mothballs disappear over time.
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