Mixture |
Glossary Index |
Mouse |
MSDS Topics |
Free Sites | FAQ's | Regulations | Glossary | Software | Suppliers |
Books | Forum | Poll | Fun stuff | Quiz | Store | |
Understand your MSDS with the MS-Demystifier | Search ALL our MSDS info |
Mole, atomic weight, formula weight, molar mass |
This number can be determined experimentally to be 6.022 x 10^{23} (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 (H_{2}O) has 6.022 x 10^{23} water molecules, a mole of carbon atoms has 6.022 x 10^{23} carbon atoms and a mole of automobiles (rather unlikely) would have 6.022 x 10^{23} 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 ^{12}C (carbon) atoms will weigh 12 grams, a mole of ^{197}Au (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:
| (sponsored information) 400,000 MSDS's in your shirt pocket... with the MSDS Hazard Communication Mobile Desktop from Safety Emporium. |
Therefore, the atomic weight of a ^{12}C atom is 12 amu. ^{14}N atom has an atomic weight of 14 amu. You can look these values up in any chemistry textbook or on the web at WebElements.
See also: Chemical formula, IUPAC, mass units, molarity.
Additional definitions from Google and OneLook.
Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.