|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 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:
400,000 MSDS's in your shirt pocket...
with the MSDS Hazard Communication Mobile Desktop from Safety Emporium.
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.
Entry last updated: Saturday, June 11, 2016. This page is copyright 2000-2016 by ILPI. Unauthorized duplication or posting on other web sites is expressly prohibited. Send suggestions, comments, and new entry desires (include the URL if applicable) to us by email.
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.