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30 valence electrons.

Valence electrons are on the outer shell of a atom. To find valence electrons, subtract the amount of electrons the noble gas has before the element from the number of electrons the element actually has.

Since the noble gas before carbon is Helium, you subtract 2 electrons from 6 electrons which gives you 4 valence electrons.

Since there are 6 carbon atoms, multiply 4 by 6 to get 24.

Do the same to the hydrogen atoms and add the valence electrons of the two molecules together and you should get 30 total valence electrons.

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