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. Balance any oxygen or hydrogen atoms last.Balance atoms present in a single molecule of reactant and product first.Basically, you look at how many atoms you have on each side of the equation and add coefficients to the molecules to balance out the number of atoms. There is a strategy that will help you balance equations more quickly. As with subscripts, you don't write the coefficient of "1", so if you don't see a coefficient, it means there is one molecule. If, for example, you write 2 H 2O, that means you have 2 times the number of atoms in each water molecule, which would be 4 hydrogen atoms and 2 oxygen atoms. When balancing equations, you never change subscripts. You add coefficients. Coefficients are whole number multipliers. Add Coefficients To Balance Mass in a Chemical Equation
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