1. S+O2=SO2;
2. 2SO2+O2=2SO3;
3. SO3+H2O=H2SO4;
4. H2SO4+2Na=Na2SO4+H2↑.
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Answers & Comments
1. S+O2=SO2;
2. 2SO2+O2=2SO3;
3. SO3+H2O=H2SO4;
4. H2SO4+2Na=Na2SO4+H2↑.