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This template calculates the molecular mass (or molar mass) of a chemical compound. It is designed to be embedded in infoboxes {{ Infobox drug }} and {{ Chembox }} , but it can be used in-line just as well.
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|charge=-1 → 0.000 548 579 909 07 {{Chem molar mass|charge=-1}} → 0.000 548 579 909 070 g·mol −1 Source "electron mass in u (m e)".NIST.2014 CODATA 5.485 799 090 70 (16) × 10 −4 u 0.000 548 579 909 070 u as used (15 decimals)
Atomic number Element Molar mass Formal standard atomic weight s.a.w., formal short Note Z calculated; g·mol −1 A r, standard [1] A r, abridged and conventional [1]; C 9 H 8 O 4: 180.159 g·mol −1
The molar mass is defined as the mass of a given substance divided by the amount of the substance, and is expressed in grams per mol (g/mol). That makes the molar mass an average of many particles or molecules (potentially containing different isotopes), and the molecular mass the mass of one specific particle or molecule. The molar mass is ...
The difference is that molecular mass is the mass of one specific particle or molecule, while the molar mass is an average over many particles or molecules. The molar mass is an intensive property of the substance, that does not depend on the size of the sample. In the International System of Units (SI), the coherent unit of molar mass is kg ...