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help me to do this work balance molecular equations?

___ Fe + ____ S --> ___ FeS

___ h2so4 + ___ naoh --> na2so4+ ___ h2o

____ Fe + ____ s --> ____ Frs

1.___Fe + ___ s--> ___ FeS


2.___ H2 + ___ Cl2 --> ___ HCl


3.____ Mg + _____ O2 --> ___ MgO


_____ Na2O2 + ____ H2SO4 --> _____ Na2SO4 + _____ H2O2

___ fe + ___ s--> ___ FeS