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On Sun, May 08 2011, Alan McKinnon wrote: |
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> Apparently, though unproven, at 00:14 on Monday 09 May 2011, john did opine |
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> thusly: |
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> |
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>> Great widgets. Not sure what a Molar Mass Calculator does? Perhaps |
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>> weighs your teeth?? |
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> |
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> :-) |
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> |
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> "Molar" as in the adjective describing "mole" as in "quantity of matter" as in |
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> "some gigantic number of identical atoms (or maybe it's molecules)". It's a |
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> very useful measure of "some quantity of stuff". |
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> |
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> IIRC the gigantic number is Avogadro's number, on the order of 10^124. So one |
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> mole of hydrogen would be the amount of hydrogen containing that number of |
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> hydrogen atoms (or maybe it's molecules. Whatever.) |
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6.022 x 10^23 |
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The number of atoms (or molecules) needed so that the weight in grams is |
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the atomic (or molecular) weight. |
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Helium has atomic weight of ~4, so 6.022*10^23 atoms of helium weight |
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about 4 grams. |
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allan |
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