Recall that when balancing chemical equations, we have to make sure that the number of elements on both sides is equal with the lowest whole number coefficients.
Balance O: We have 2 O on the reactant side and 3 N on the product side – add a coefficient of 3 to O2 and add a coefficient of 2 to Fe2O3:
__ Fe(s) + 3 O2(g) → 2 Fe2O3(s)
What is the coefficient for iron metal after the following reaction is balanced:
_?_ Fe (s) + _?_ O2 (g) → _?_ Fe2O3 (s)?
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