S+Mg--->MgS
MgS+2 HCl--->H2S+MgCl2
H2S+CuCl2--->CuS+2 HCl
CuS+O2--->SO2+Cu
2 SO2+O2--->2 SO3
SO3+CaO--->CaSO4
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S+Mg--->MgS
MgS+2 HCl--->H2S+MgCl2
H2S+CuCl2--->CuS+2 HCl
CuS+O2--->SO2+Cu
2 SO2+O2--->2 SO3
SO3+CaO--->CaSO4