Balancing Equation

-The aim of balancing an equation is to make the number of atoms of each side is equal

STEP:
1.balance the atoms which only occur in one molecule
2.balance whole groups whenever possible (SO4,NO3,ClO3...)
3.Balance atoms which occur in elemental form last

1PbO2+4HBr--->2H2O+1PbBr2+1Br2

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