What are the chemical formula of diamond and graphite? Just C or C4?
As said by your friends, the chemical formula of diamond and graphite will be simply C and not C4. This is because both the substances involve extensive bonding between its constituent carbon atoms. Thus there are not mere 60 atoms of carbon, rather both diamond and graphite can be regarded as macromolecules of carbon.
@ Divya and Komal, very good attempt. Keep it up :)