Question

How to balance a chemical equation?? H2 + O2 = H2O, How?? I am weak in chemistry write in simple english.

Answer 1

we will balance the equation by equal numbers on both side... it means...
2H2+O2=2H20

IT IS BECAUSE we need 4 h on both sides
and 2 o on both sides...

Answer 2

First balance O on each side
Then H
So, it will be
2H2 + O2 ---> 2H2O