Составить уравнения по цепочкам:
1) Na→ Na2O→ NaOH→ Na2CO3 → H2CO3 → CO2
2) Cu ←1 CuO 2→ CuCl2 3→ Cu(OH)2 4→CuO 5→ CuSO4
3) C 1→ CO2 2→ H2CO3 4→ Na2CO3 5→ H2CO3 6→CO2 7→ Na2CO3
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