Solution.
"Mn^{7+} + 3e = Mn^{4+}"
"O^{-1} - 1e = O^0"
"Cn(KMnO4) = \\frac{C(KMnO4)}{3}"
"m(H2O2) = \\frac{Cn(KMnO4) \\times V(KMnO4) \\times Meq(H2O2)}{1000}"
"m(H2O2) = \\frac{0.56 \\times 22 \\times 34.01}{1000} = 0.42 \\ g"
Answer:
m(H2O2) = 0.42 g
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