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Atomic number Element Molar mass Formal standard atomic weight s.a.w., formal short Note Z calculated; g·mol −1 A r, standard [2] A r, abridged and conventional [2]; C 9 H 8 O 4: 180.159 g·mol −1
Sodium oxide is a chemical compound with the formula Na 2 O.It is used in ceramics and glasses.It is a white solid but the compound is rarely encountered. Instead "sodium oxide" is used to describe components of various materials such as glasses and fertilizers which contain oxides that include sodium and other elements.
In chemistry, the molar mass (M) (sometimes called molecular weight or formula weight, but see related quantities for usage) of a chemical compound is defined as the ratio between the mass and the amount of substance (measured in moles) of any sample of the compound. [1] The molar mass is a bulk, not molecular, property of a substance.
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
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Number average molar mass (M n), also loosely referred to as number average molecular weight (NAMW). Mass average molar mass (M w), where w stands for weight; also commonly referred to as weight average or weight average molecular weight (WAMW). Z-average molar mass (M z), where z stands for centrifugation (from German Zentrifuge).
For example, the macroscopic mass of oxygen (O2) does not correspond to the microscopic mass of O2. The former usually implies a certain isotopic distribution, whereas the latter usually refers to the most common isotope (16O2). Note that the former is now often referred to as the "molecular weight" or "atomic weight [1]
|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)