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Mercury (II) oxide decomposes to mercury and oxygen. In the chemical equation below, what is the subscript, x, on the oxygen equal to? ------------- 2 HgO --> 2 Hg + O-x-
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Mercury (II) oxide decomposes to mercury and oxygen. In the chemical equation below, what is the subscript, x, on the oxygen equal to? ------------- 2 HgO --> 2 Hg + O-x-

User Jigneshsinh Rathod
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The correct subscript for the reaction would be two. Oxygen gas exists as a diatomic molecule in nature. Also, the subscript two would balance the reaction. In balancing reactions, it is important that the atoms on each side of the reaction is equal.
User Extraeee
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