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C = 12 g/mol
O = 16 g/mol
Mg: 28.8 g / 24 g/mol = 1.2 mol
C: 14.2 g / 12 g/mol = 1.183 mol
O: 57 g / 16 g/mol = 3.563 mol
dividir
Mg : 1.2 mol / 1.2 mol = 1
C: 1.183 mol / 1.2 mol = 0.985 ≈ 1
O: 3.563 mol / 1.2 mol = 3
FE: MgCO3