Use the value of the Avogadro constant, which is 6.02214129 x 10^23 mol-1. Find the atomic mass of the element by using the periodic table of elements. For example, the atomic mass of sulfur (S) is 32.07 g/mole. Divide the atomic mass of the element by the Avogadro constant to calculate the mass of the single atom.
32.066 atomic mass units.
We are given 1 atom of sulfur; 1 mole of sulfur = 6.023*10^23 atoms of sulfur; moles in 1 atom of sulfur = 1/6.023*10^23 = 1.66*10^-24 mol; The average mass of a single sulfur atom in grams = 32.065g/mol*1.66*10^-24 mol = 5.324*10^-23g
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