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1Count the atoms of each element in the reactants and the products.
 2.Use coefficients; place them in front of the compounds as needed

H2 + O2 -> H2O
To balance this the unbalanced oxygen molecules, we add 2 in front of the product on R.H.S means in products . We get,H2 + O2 -> (2) H2O
Now, we have 2 Oxygen's but 4 Hydrogen's on the R.H.S.
 In order to balance the same, we add an another 2 in front of Hydrogen on the L.H.S
(2) H2 + O2 -> (2) H2O
Now, the equation is balanced with 4 Hydrogen's (H) and 4 Oxygen's on both sides.

You need to practice this In starting it looks difficult but once the concept is clear in your mind you can easily do it

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how to do it with chemical decomposition reaction with example of calciumoxide
thanks for the information!
2CaO -2 Ca + O2 this one .I havent heard about calcium monooxide its calcium oxide only .iF its there given me equation
not a right answer
do a check to be sure: u have 2 nitrogen atoms on left and 2 nitrogen atoms in left. u have 6 hydrogen atoms in left nd 6 in right.
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