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Na --1-->Na2O --2-->NaOH--3-->NaNO3
| |
4 5|
|___> NaBr
1. 4Na+O₂→2Na₂O
2.Na₂O+H₂O→2NaOH
3.NaOH+HNO₃→NaNO₃+H₂O
4.2Na+Br₂→2NaBr
5.Na₂O+2HBr→2NaBr+2H₂O