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|Mole, atomic weight, formula weight, molar mass|
This number can be determined experimentally to be 6.022 x 1023 (602,200,000,000,000,000,000,000), a number which is called Avogadro's number. The mole is simply a convenient unit for dealing with large numbers just like it is easier to talk about the weight of a ship in tons rather than ounces.
"Mole" has several other possible meanings, of course, but none of these generally applies to material safety data sheets.
A mole of anything has Avogadro's number of objects in it. So a mole of water (H2O) has 6.022 x 1023 water molecules, a mole of carbon atoms has 6.022 x 1023 carbon atoms and a mole of automobiles (rather unlikely) would have 6.022 x 1023 automobiles.|
Clearly, if the objects we are talking about have different masses (weight), then a mole of one substance will also have a different mass than the other. So while a mole of 12C (carbon) atoms will weigh 12 grams, a mole of 197Au (gold) atoms will weight 197 grams and a mole of sodium chloride (NaCl, table salt) will weigh 58.45 grams.
How were we able to tell you that? Using these terms and definitions:
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Therefore, the atomic weight of a 12C atom is 12 amu. 14N atom has an atomic weight of 14 amu. You can look these values up in any chemistry textbook or on the web at WebElements.
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