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23-05-2023
Chemistry

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Select all of the equations which demonstrate the law of conservation of mass.
A Mg + S → MgS2

B C + O2 → C2O

C 4Cu + O2 → 2Cu2O

D 2H2 + O2 → 2H2O

E H2SO4 + Zn → 4ZnSO + H2

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