1. NaHCO3→ Na2Co3 + H20 + CO2
2.HNO3 +H2S → NO2 +H20 + S
3.P + HNO3→NO2 + H2O + H3PO
4.Zn + HNO3 → Zn(NO3)2 +H20 + NO2
Please balance this equation
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