S -> K2S -> H2S -> SO2 -> SO3 -> H2SO4

Question

S -> K2S -> H2S -> SO2 -> SO3 -> H2SO4

Answer 1

S+2K=K2S
2K2S+2H2O=2H2S+2KO2
H2S+O2=SO2+H2
2SO2+O2=2SO3
SO3+H2O=H2SO4