C6H6 Share definition Flag The molecular formula for the aromatic cyclic hydrocarbon Benzene. Benzene's molecular formula is C6H6; it has 6 Carbon atoms and 6 Hydrogram atoms. C6H6 by TKA November 21, 2006 0 0 Get merch Get the C6H6 mug. Buy Now — $32.95 See more merch