Question

Balance following equation in acidic medium showing all steps:

Br2 + H2O2- ---> BrO2 + H2O

Answer 1

The balanced equation is :
Br2 + 4 H2O2 = 2 BrO2 + 4 H2O

Answer 2

First, balance Br atoms. So on the RHS you get
   Br2 + H2 O2  ====> 2 Br O2 + H2 O  
  Now  let n be num of molecules of H2O2.

  Br2 +  n  H2 O2 ==>  2 Br O2  +  x  H2O
   2n H atoms on left  and 2 x  H atoms on right    =>  n = x
   now  2n atoms of O on LHS.    4 + n on right side.
     =>  2n = 4 + n    =>  n = 4

  Br2 +  4  H2 O2 ==>  2 Br O2  +  4  H2O