In this page, we will look at some examples of applying
Rule 2: Balancing chemical equations using the two’s and three’s technique.
Balance the equation
Fe + O2 → Fe2O3
Step 1: On the left side of the equation there are 2 oxygen atoms and on the right side of the equation there are 3 oxygen atoms. To balance the oxygen atoms, multiply Fe2O3 by the coefficient of 2 and the O2 by the coefficient of 3
Fe + 3O2 → 2Fe2O3
Step 2: Balance the Fe by placing the coefficient of 4 in front of Fe
4Fe + 3O2 → 2Fe2O3
Step 3: Check that all the atoms balance and make sure that all coefficients are in the lowest-possible ratio.
The following videos show some examples of using the twos and threes method to balance chemical equations.
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