11. Aromatic hydrocarbons are ringlike structures with a cyclic base of six carbon atoms.12. Classified as an aromatic hydrocarbon , it is a flammable colorless liquid. 13. The edit to Aromatic hydrocarbon linked to carbon dioxide, but not carbon monoxide. 14. Non-Kekul?polynuclear aromatic hydrocarbons are composed of several fused six-membered rings. 15. Tobacco smoke contains over fifty known carcinogens, including nitrosamines and polycyclic aromatic hydrocarbons . 16. However some areas are contaminated by aromatic hydrocarbons ( 500.25 cubic meters ). 17. Pitch is a viscoelastic material that is composed of aromatic hydrocarbons . 18. Words like particulates, benzene and polycyclic aromatic hydrocarbons pop up in her speech. 19. However, the following mechanisms are generalized to all thermal isomerizations of aromatic hydrocarbons . 20. The methods were first described for the association of iodine dissolved in aromatic hydrocarbons .