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valencia del litio = +1
Sulfuro = +2
+1 -2
Li S SE REALIA INTERCAMBIO DE VALENCIA =Li2S
2) Fe(ClO3)3 = CLORATO FÉRRICO
(ClO3)⁻¹ = ION CLORATO
Fe = +3
3) CaSO4 = SULFATO DE CALCIO
(SO4)⁻² = ION SULFATO
Ca = +2
+2 -2
Ca (SO4) = Ca₂ (SO4)₂ LOS SUBINDICES SON PARES SE SIMPLIFICAN Y QUEDA CaSO4