что нужно прибавить?
H2S+?-->H2SO4
S+?-->H2S
FeS+?-->H2S
SO2+?-->H2SO4
S+?-->SO2
H2S+?-->H2SO4
S+?-->H2S
FeS+?-->H2S
SO2+?-->H2SO4
S+?-->SO2
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Answers & Comments
S + H2 = H2S
FeS + 2HCl = FeCl2 + H2S↑
2SO2 + 2H2O + O2 = 2H2SO4
S + O2 = SO2