Science / The Case of the Missing Subscripts: The Sequel

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Can you name the missing single-digit integer that correctly completes each chemical formula?

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Chemical Name and FormulaMissing Subcript
1-Pentanol: C__H12O
Lead (IV) Chromate: Pb(CrO__)2
Hydrogen Cyanide: HCN__
Dinitrogen Tetroxide: N2O__
Heptaphosphorus Octafluoride: P7F__
Trirhenium Nonachloride: Cl__Re3
Potassium Carbonate: K__CO3
Hydrogen Peroxide: H2O__
Chemical Name and FormulaMissing Subcript
Ammonium Oxalate: C2H__N2O4
Hemin: C34H32ClFeN__O4
Sulfuric Acid: H2SO__
Barium Fluoride: BaF__
Ethane: C2H__
Methanol: C__H3OH
Sodium Bicarbonate: NaHCO__

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