Помогите, пожалуйста!
Na-->Na2O-->NaOH-->Na2SO4
1) Na + ... -->Na2O
2) Na2o + ... -->NaOH
3)NaOH + ... -->Na2SO4
4)Na + ... -->NaOH

P-->P2O5-->H3PO4-->K3PO4
1)P + ... -->P2O5
2)P2O5 + ... -->H3PO4
3)H3PO4 + ... -->K3PO4
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