Which of the following reactions violates the Law of Conservation of Mass?
\(\mathrm{2Mg + O_2 \rightarrow MgO}\)
A chemical equation obeys the Law of Conservation of Mass only when it is balanced, i.e. the number of atoms of each element is equal on both sides.
\(\mathrm{2Mg + O_2 \rightarrow MgO}\) has 2 Mg and 2 O atoms on the left but only 1 Mg and 1 O atom on the right, so it is not balanced, while the other three equations balance correctly.
Hence, \(\mathrm{2Mg + O_2 \rightarrow MgO}\) violates the Law of Conservation of Mass.
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