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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.
3 comments:
1.26527 x 10^26 water molecules in one gallon of water
I 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.
Ok! 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.
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