1. 4 Na+O2--->2 Na2O
2. Na2O+H2O--->2 NaOH
3. 2 NaOH+H2SO4--->Na2SO4+2 H2O
4. 2 Na+2 H2O--->2 NaOH+H2
5. Na2O+SO3--->Na2SO4
6. 2 Na+H2SO4--->Na2SO4+H2
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Verified answer
1. 4 Na+O2--->2 Na2O
2. Na2O+H2O--->2 NaOH
3. 2 NaOH+H2SO4--->Na2SO4+2 H2O
4. 2 Na+2 H2O--->2 NaOH+H2
5. Na2O+SO3--->Na2SO4
6. 2 Na+H2SO4--->Na2SO4+H2