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Two days ago I mentioned caffeine. Well, I was bored as usual today. So I whipped out my slide rule and made some calculations. (Note: I do not, nor have I ever, owned a slide rule). The average American ingests 300 mg of caffeine per day (According to some site that I can no longer find). So, I was wondering, how many caffeine molecules that is. The chemical makeup of caffeine is C8H10N4O2 with an atomic weight of 194.19. With the help of Avogadro's Number and a little high school chemistry stoichiometry, I figured it to be somewhere around 93,000,000,000,000,000,000 caffeine molecules per day. (Note 2: I really don't remember how to do stoichiometry correctly. I have very little confidence that my answer is correct. I'm sure that Mr. Abrams will gladly give us the correct answer).
Chemistry homework for tonight: A gallon of water weighs 8.33 pounds. How many water (H2O) molecules are in that gallon? (For the super nerds out there - assume that it's only water. No minerals or anything).
Hint #1: The molecular weight of water is 18.015. If that scares you, just use 18.
Hint #2: 1 kilogram = 2.2 pounds.
1.26527 x 10^26 water molecules in one gallon of water
ReplyDeleteI believe your number of caffeine molecules is off by one decimal place. It should be 930,000,000,000,000,000,000. Otherwise, good work with stoich.
ReplyDeleteOk! Ok! I must have, I must have put a decimal point in the wrong place or something. Shit. I always do that. I always mess up some mundane detail.
ReplyDelete