![]() To get the formula from the triangle, cover up the value you want to calculate and use the remaining two values. To remember the formulas in this section, you can use the formula triangles. ![]() For example, about 98.9% of naturally occurring carbon is 12C ('Carbon 12') and about 1.1% is 13C so carbon has an atomic weight of \begin Formula Triangles The atomic weight (or atomic mass) of an element tells us on average how much one atom of a given element weighs, taking into account typical proportions of isotopes. Contents Toggle Main Menu 1 Atomic Weight 2 Molecular Weight 3 Moles 4 Solutions 4.1 1) Molarity 4.2 2) Mass Concentration 4.3 A note on units for concentrations 4.4 Diluting Solutions 5 Test yourself Atomic Weight
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