Uzupełnij rekacje chemiczne: a. H2 + O2--> H2O b. HgO --> Hg + O2 c. Na + Cl2 --> NaCl
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a. 2H2 + O2--> 2H2O
b. 2HgO --> 2Hg + O2
c. 2Na + Cl2 --> 2NaCl