x - własnie co tam trzeba wpisać
S + x -> SO2
SO2 + x -> SO3
SO3 + x -> H2SO4
H2SO4 + x -> Na2SO4
SO2 + x -> Na2SO3
SO3 + x -> Na2SO4
H2SO4 + x -> BaSO4
BaS04 + x -> BAO
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S + O2 -> SO2
2 SO2 + O2 -> 2 SO3
SO3 + H2O -> H2SO4
H2SO4 + 2Na -> Na2SO4 + H2
Na20 + SO2 -> Na2So3
Na2O + SO3 -> Na2SO4
H2So4 + Ba -> BaSO4 + H2
BaSO4 -> BaO + SO3