Chemistry, 06.08.2021 07:50 madams4450

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2NaCl, 5Cu, 3CO2, 5H2O, 6Zn, 8O2

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Cách viết sau chỉ ý gì?
2NaCl, 5Cu, 3CO2, 5H2O, 6Zn, 8O2...