In this page, we will look at some examples of applying

Rule 2: Balancing chemical equations using the two’s and three’s technique.

Example:

Balance the equation

Fe + O_{2} → Fe_{2}O_{3}

Solution:

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 Fe_{2}O_{3} by the coefficient of 2 and the O_{2} by the coefficient of 3

Fe + 3O_{2} → 2Fe_{2}O_{3}

Step 2: Balance the Fe by placing the coefficient of 4 in front of Fe

4Fe + 3O_{2} → 2Fe_{2}O_{3}

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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