The molecular formula C3H4 (molar mass: 40.06 g/mol, exact mass: 40.0313 u) may refer to:
- Cyclopropene, a cyclic alkene
- Propyne (a.k.a. methylacetylene), a common alkyne
- Propadiene, an allene
This set index page lists chemical structure articles associated with the same molecular formula.
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