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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Correct Answer: 85
Solution and Explanation
Moles of KMnO4 = \(\frac{0.316}{158} = 0.002\) mol.
Moles of H2O2 = \(0.002 \times \frac{5}{2} = 0.005\) mol, mass = \(0.005 \times 34 = 0.17\) g.
Purity = \(\frac{0.17}{0.2} \times 100 = 85\%\).
Answer: 85
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