The "pent" is the clue here. That means 5 carbon atoms.
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12 carbons...
Pentane has 5 carbon atoms in its structure.
Ethylene (C2H4) has two carbons and four hydrogens making 6 atoms.
Propane is CH3-CH2-CH3. There are six primary carbons and two secondary carbons (CH2) in propane.
Pentose sugar has 5 carbon atoms if that's what your asking..!(: