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Determine how many atoms of each different element are in the formula.The molar mass of a substance can be found by dividing the mass in grams by the number of moles of the substance, thus giving us the mass per mole of the substance.Ĭalculating Molar Mass Four steps to calculating a substance's molar mass:.The mass of one mole of a substance is called its molar mass with units of g/mol.But it is possible to determine the mass of large amounts of them using a balance. Counting atoms or molecules is very difficult since they are so small.Carbon-12 is defined as weighing exactly 12 u per atom. The old symbol was amu, while the symbol "u" is now used. An atomic mass unit is defined as 1/12 the mass of the carbon-12 isotope.
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It is more commonly referred to as molecular weight and abbreviated as MW.The molecular mass of a substance is the mass in atomic mass units (amu) of all the atoms in a given molecule.