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A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acid solution. The purity of H2O2 (in %) is ___________ (mol. wt. of H2O2=34; mol. wt. of KMnO4=158)

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answer is 85.

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Detailed Solution

eH2O2=eKMnO4nH2O2(2)=nKMnO4(s)nH2O2=520.316158nH2O2=10−22WH2O2=17×10−2 Mass % of H2O2=17×10−2×1000.2=85

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A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acid solution. The purity of H2O2 (in %) is ___________ (mol. wt. of H2O2=34; mol. wt. of KMnO4=158)