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The standard atomic weights of twelve elements having two or more stable isotopes have variability of atomic-weight values in natural terrestrial materials. These are given in table 1 below. In the other lists the values quoted are those suggested for material where the origin of the sample is unknown.
- 2019 Atomic Weights
ATOMIC WEIGHTS OF THE ELEMENTS 2019. These tables are based...
- 2019 Atomic Weights
Data table of molecular weight of common materials. The molar mass of a substance, also often called molecular mass or molecular weight (although the definitions are not strictly identical, but it is only sensitive in very defined areas), is the weight of a defined amount of molecules of the substance (a mole) and is expressed in g/mol.
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
Our table of molar masses has over 160 values covering 84 elements. Each value has a full citation identifying its source. The integrated unit conversion calculator can quickly convert a value to the units that you need.
Isotopic Composition. Standard Atomic Weight. Notes. 1. H. 1. 1.007 825 032 23 (9) 0.999 885 (70) [1.007 84, 1.008 11]
Use this visual tool for calculating molar mass for any chemical formula. Options for hiding the symbol or name of the elements provide a handy learning aid for memorizing the periodic table. Please note that the chemical formula is not limited to the known chemical compounds.
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]
