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## Homework Statement

How many pi bonds are in the molecule C12H18?

## Homework Equations

I have in my notes the formula (6nPi+2-total # of electrons)/2.

## The Attempt at a Solution

Unfortunately I can't find an explination for this formula in the book and I don't remember what was shown in lecture. I do know that there are 66 valence electrons total in this molecule. I also understand the basic definitions of pi and sigma bonds.