Xylene’s molecular formula is C8H10 also known as C6H4 (CH3 )2 Molecular structures of the three xylene isomers are represented as follows. Para-xylene is a flammable, colorless aromatic hydrocarbon that exists as a liquid at ambient pressure and temperature , xylenes are the ortho-, meta-, and paraisomers of dimethyl benzene, where the ortho-, meta-, and para- prefixes refer to which carbon atoms on the benzene ring the two methyl groups are attached.