The following equation is not balanced: Mg(s) + O2 2MgO (s).
In order to balance the equation, a coefficient of 2 needs to be placed directly
A) after the symbol for magnesium on the left side of the equation.
B) after the symbol for oxygen on the left side of the equation.
C) before the symbol for oxygen on the left side of the equation.
D) before the symbol for magnesium on the left side of the equation.
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