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18. MIKE ANGEL EDIT! :)
Ok, I cheated. I googled the answer. I do understand the formula, tho. I took chemistry courses... wow. 10 years ago. I used to tell my daughter "I love you. " She'd say "How much?" So I told her "Avogadro's number." :D
I haven't used the knowledge in so long I would probably have to work to remember it now.
So I'll let somebody else do the math for the points ;)