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What is the Structural Formula of Heptane and Octane?

Heptane (C7H16) is commonly represented
by the structural formula

Heptane Structural Formula

and octane (C8H18) by the structural formula

Octane 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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