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*Ar O = 16
*Massa O2 = 4 gram
*Avogadro = 6,02 x 10^23
*Banyak atom O2 ?
A. Mencari mol
--> n = g/Mr O2
= 4 gram/ (2 x 16) g/mol
= 0,125 mol
B. Mencari banyak atom O2
--> N = n x L (L = bilangan avogadro)
= 0,125 mol x 6,02 x 10^23
= 7,525 x 10^22