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Sn: 1 x 118.7 = 118.7 g/mol
O: 2 x 16 = 32 g/mol
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Mm = 150.7 g/mol
estaño:
100 % ........ 150.7 g
x ------- 118.7 g
x = 78.76 % Sn
OXIGENO
100% ------- 150.7 g
x ------- 32 g
x = 21.23 % O