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The molecular formula of ethanol is C2H4O. This shows that each molecule of ethanol contains two carbon atoms.
A molecule of ethanol (C2H6O) contains a total of 9 atoms: 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom.
There are 5 atoms of carbon in a xylose molecule.
There are 2 carbon atoms in one molecule of tetraethyl.
There are three carbon atoms in a molecule of pyruvate.