Unbalanced equation: Fe + O2 → Fe2O3
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The balance equation is
4Fe + 3O2 → 2Fe2O3
Consider the mole ratio: 4 Fe/3 O2 = 1.33333.
Now compare the
actual value of the moles to the value you just got. So, 6.8 mol Fe/8.9
mol O2 = .7640.
As you can see, .7640 is less than 1.333, meaning that
Fe is the limiting reagent. If the compared value of the moles were
bigger than 1.333, then O2 would be limiting.
So Fe (IRON) is the limiting reactant.
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