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The nomenclature of propane is:
CH3-CH2-CH3 or CH3CH2CH3 or C3H8

CH3-CH2-CH3 or CH3CH2CH3 or C3H8
propane is the organic chemical. its the three carbon chemical, so it called propane.

The naming of biological units, such as species.

Nomenclature is concerned with naming chemical compounds and writing their formulas.

The nomenclature of propane is:
CH3-CH2-CH3 or CH3CH2CH3 or C3H8