Enter any chemical formula optionally with parenthesis and crystal water as in this example:
Please use proper capitalization! NO (nitrogenmonoxide) and No (nobelium) are not the same. Chemical formulas with many levels of parenthesis are accepted.
On recommendation by The International Union of Pure and Applied Chemistry, IUPAC, atomic weights of the elements are taken from Atomic weights of the elements 2007, published in Pure Appl. Chem., Vol. 81, No. 11, pp. 2131-2156, 2009.
The Relative Molar Mass Calculator on this site is based on atomic weights from a later publication.
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