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2014-07-28T13:07:32+05:30

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

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2014-07-28T15:29:53+05:30

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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


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