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Butane means the molecule has 4 carbon atoms.

Iso means one of those carbons is a side chain.

The resulting molecule is something with a tetraeder shape, a carbon atom at the center with one hydrogen side "chain" and three CH3 side chains. (remember a carbon can make a total of 4 bonds. The formula for isobutane is therefore CH(CH3)3 or C4H10 for a grand total of 10 hydrogen atoms.

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10y ago

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