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Fe: 2 x 56 = 112 g/mol
O: 3 x 16 = 48 g/mol
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Mm = 160 g/mol
HIERRO
160 g ---- 100 %
112 g ---- x
x = 70 % Fe
OXIGENO
160 g ---- 100 %
48 g ---- x
x = 30 % O