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Count the number of reactants and products and then multiply either sides by the numbers so as to make both sides equal
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Can you please show me how to do this
okk i am messaging u the way
H2 + O2 gives H2O
on reactant side H is 2 and O is also 2 but on product side-
so H2 +O2 gives 2H2O
To balance an equation means having the same no. of products in the LHS and RHS
for ex. to balance an equation = Mg + O2 ------------> MgO
as this equation is not balanced then u need to balance it 
elements       LHS    RHS
Mg                      1         1
O                         2         1*2= 2
now the balanced equation is -------------> 2MgO

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