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Answer 1 · 2017-02-19T16:50:48

The formula of ethane is $"C"_2"H"_6$ .

Each $"C"$ atom has 4 valence electrons and each $"H"$ atom has 1 valence electron.

∴ A molecule of $"C"_2"H"_6$ has $2×4 + 6×1= 8 + 6 = 14$ valence electrons.

You can count them in the structure of ethane.

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Each line represents a bond (a pair of electrons).

The 7 bonds contain 14 valence electrons.