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1:__Cu20 + ___C ↠__Cu + ___CO2

2:___ Na + ___O2 ↠ ___ Na2O
3:___ C2H4 + ___ O2 → ___ CO2 + ___ H2O
4:___ C4H10O + ___ O2 ↠ ___ CO2 + ___ H2O

User Kup
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Answer:

Step-by-step explanation:

User Alexei Shcherbakov
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