Iron is balanced, with 4 atoms of iron on each side of the equation. By inspection (i.e., looking at it), you know you have to discard a coefficient of 2 for some higher number.ģ Fe doesn't work on the left because you can't put a coefficient in from of Fe 2O 3 that would balance it.Ĥ Fe works, if you then add a coefficient of 2 in front of the rust (iron oxide) molecule, making it 2 Fe 2O 3. While that would balance iron, you already know you're going to have to adjust oxygen, too, because it isn't balanced. ![]() There is one atom of iron on the left and two on the right, so you might think putting 2 Fe on the left would work. Iron is present in one reactant and one product, so balance its atoms first.
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