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H: 0.8 g / 1 g/mol = 0.8 mol
O:
1 mol ---- 6.022 x 10²³ átomos
x ---- 1.2 x 10²³ átomos
x = 0.199≈ = 0.2 mol de O
mol de C: 0.4
dividir entre el menor de los resultados cada elemento
C: 0.4 mol / 0.2 mol = 2
H: 0.8 mol / 0.2 mol = 4
O: 0.2 mol / 0.2 mol = 1
FE: C2H4O