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The molecular mass (Mr) or molecular weight MW of a substance, is the mass of one molecule of that substance, relative to the unified atomic mass unit u (equal to 1/12 the mass of one atom of 12C, see also relative atom masses). Due to this relativity, the molecular mass of a substance is commonly referred to as the relative molecular mass (abbreviated to Mr). Note that the molecular mass depends on the isotopic composition of the particular molecule. This program uses the natural abundances of all stable isotopes of a particular element to calculate the "chemical" molecular weight.
Many thanks to Ihor Patsay, Ivan Franko National University of Líviv, Ukraine, who contributed the molecular weight calculator to the Learning by Simulations Web site.