The quantity (in grams) of a chemical which equals the molecular weight. This amount equals 6. 023 x 1023 molecules (Avogadro's number) of the substance (e. g. sodium chloride has a molecular weight of 58. 5 so one mole of salt equals 58. 5 g)
W. A. N Dorland and E. J. Taylor (editors), Glossary of MSDS Terms, Texas A&M University, USA 2001. http://www.bio.tamu.edu/USERS/TONNA/GLOSSARY.HTM, (MSDS - Amer) {631}