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Volume strength of H2O2=5.6*Normality
56 volume strength of
=5.6*Normality
Normality=56/5.6=10
In terms of normality
As Milli equivalents
of reacted= Equivalent of 
Moles of
Weight of
% purity of
in the sample
=(0.1*375)/55
=(0.6818)*100
=68.18%