TNT (Trinitrotoluene) (C₇H₅N₃O₆) — Properties, Uses & Safety

Overview

TNT, or 2,4,6-trinitrotoluene (C7H5N3O6), is a pale yellow crystalline solid with a molar mass of 227.13 g/mol. It is one of the most widely recognized explosives in the world, used extensively in military munitions and industrial demolition since its adoption in the early 1900s. TNT's IUPAC name, 2-methyl-1,3,5-trinitrobenzene, describes its structure: a toluene (methylbenzene) molecule with three nitro groups attached at the 2, 4, and 6 positions of the aromatic ring. What makes TNT particularly useful as an explosive is its remarkable chemical stability under normal conditions — it can be melted at 80.35 degrees C and cast into shells without detonating, and it is relatively insensitive to impact, friction, and heat compared to other explosives like nitroglycerin. TNT requires a detonator to initiate its explosive decomposition. GHS hazard codes include H201 (explosive, mass explosion hazard), H301 (toxic if swallowed), H311 (toxic in contact with skin), H331 (toxic if inhaled), H373 (may cause organ damage through prolonged exposure), and H411 (toxic to aquatic life). The explosive power of TNT is so well-characterized that it serves as the standard reference for measuring explosive energy — the ton of TNT equivalent (4.184 gigajoules) is used to quantify everything from bomb yields to asteroid impacts. The detonation of TNT produces a rapid exothermic decomposition: 2 C7H5N3O6 -> 12 CO + 5 H2 + 3 N2 + 2 C, releasing enormous volumes of gas almost instantaneously. For chemistry students, TNT illustrates several important concepts: aromatic substitution reactions (nitration of toluene), the relationship between molecular structure and explosive properties, exothermic decomposition reactions, and the concept of oxygen balance in energetic materials. TNT also provides a real-world context for discussing the dual-use nature of chemical knowledge and the ethical responsibilities of chemists.

IUPAC Name

2-methyl-1,3,5-trinitrobenzene

CAS Number

118-96-7

PubChem CID

8376

Molecular Formula

C₇H₅N₃O₆

Molar Mass

227.132 g/mol

State at STP

solid

Appearance

Pale yellow to yellow-brown crystalline solid