![]() ![]() Now, look at the equation (use inspection) to see which coefficient will work to balance oxygen. The reason is that they usually appear in multiple reactants and products, so if you tackle them first you're usually making extra work for yourself. When balancing chemical equations, the last step is to add coefficients to oxygen and hydrogen atoms. 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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January 2023
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