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10th February 2011

Photo reblogged from Clear Science! with 98 notes

clearscience: A mole is more or less just a number for counting something. The Clear Science staff like to compare it to a dozen. You know that a dozen of something means there are 12 of that thing—for example a dozen doughnuts. A mole of something is 6.022 × 10^23 of that thing. This is called Avogadro’s number, and if you write it out not in scientific notation, it is: 602,214,179,000,000,000,000,000 The standard used to define a mole is the number of carbon atoms in 12 grams of carbon-12. This excellent website has pictures showing moles of various substances, including carbon, which we have borrowed for the graphic above. You calculate how many moles you have as shown, with the number of grams per mole you read off the periodic table. (Atomic mass, which is the number with decimal points in it.) Good explanation!

clearscience:

A mole is more or less just a number for counting something. The Clear Science staff like to compare it to a dozen. You know that a dozen of something means there are 12 of that thing—for example a dozen doughnuts.

A mole of something is 6.022 × 10^23 of that thing. This is called Avogadro’s number, and if you write it out not in scientific notation, it is:

  • 602,214,179,000,000,000,000,000

The standard used to define a mole is the number of carbon atoms in 12 grams of carbon-12. This excellent website has pictures showing moles of various substances, including carbon, which we have borrowed for the graphic above.

You calculate how many moles you have as shown, with the number of grams per mole you read off the periodic table. (Atomic mass, which is the number with decimal points in it.)

Good explanation!

Source: clearscience

  1. bestmolekiller reblogged this from clearscience
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  3. chinesechickensalad reblogged this from clearscience and added:
    NOW I FINALLY GET THIS!
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  5. avavava reblogged this from clearscience and added:
    two years ago while I was taking chemistry? WHERE WAS YOUR WHOLE TUMBLR TWO YEARS AGO?
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    Dammit, I missed
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  19. sntgatchaman reblogged this from clearscience and added:
    Good explanation!
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