1. S + 2H2 → H2S
2. H2S + Na2O → Na2S + H2O
3. Na2S + H2SO4 → Na2SO4 + H2S
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Answers & Comments
1. S + 2H2 → H2S
2. H2S + Na2O → Na2S + H2O
3. Na2S + H2SO4 → Na2SO4 + H2S