Q: How do you balance Cl2O7 plus H2O equals HClO4?

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liho+h2s=

2 PbO + C -> 2 Pb + CO2

P + Na(OH) + H20 = NaH2PO2 + PH3

42

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Balanced equation:12 HClO4 + P4O10 = 4 H3PO4 + 6 Cl2O7

Oxidation numbers up to +7 is possible. For example: +7 for Cl in HClO4 or Cl2O7. +6 for S in SO3 or H2SO4 +5 for N in HNO3 or N2O5 +4 for C in CO2

The balance is 2N2 +2O2= 4NO

2h2s + so2 ----------> 3s + 2h2o

Fe2O3 + H2SO4

liho+h2s=

C3h8 + 5o2 -> 3co2 + 4h2o

2ZnS + 3O2 = 2ZnO + 2SO2

BaCl2 + K2SO4 --> BaSO4 + 2KCl

4Li + O2 -> 2Li2O

2Al+3S--->Al2S3

HClO4 (the four is a subscript)