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Which equation demonstrates the law of conservation of mass?

A.
Mg + S → MgS2

B.
C + O2 → C2O

C.
H2SO4 + Zn → 4ZnSO + H2

D.
2H2 + O2 → 2H2O

1 answer

D.
2H2 + O2 → 2H2O
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