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What is the Structural Formula of Heptane and Octane?

Heptane (C₇H₁₆) is commonly represented
by the structural formula

and octane (C₈H₁₈) by the structural formula

where the single lines between the atoms
represent single covalent bonds.

Note that each carbon atom has four bonds (valency 4),
and each hydrogen atom has one bond (valency 1).
Valency is the combining power of an atom.

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