Balancing chemical reactions

The key point in balancing equations is that the number of atoms of each element must be the same on either side.

_BaO2-> BaO+ _O2

right side has 3 oxygen and one barium now, but on the left, only 2 oxygen and one Ba

so we will try multiplying the left with 2.

2BaO2-> BaO+ _O2

to balance the number of Ba on the right, multiply it also with 2

2BaO2-> 2BaO+ _O2

Now count the number of atoms,

4 oxygens and 2 barium on the left and the same number on the right.

So the balanced equation is 2BaO2-> 2BaO+ O2

Coefficient of BaO2 is 2 -- ans

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