\(\%mK=\dfrac{mK\times100}{M_{KMnO4}}=\dfrac{39\times100}{158}=24.7\%\)
\(\%mMn=\dfrac{mMn\times100}{M_{KMnO4}}=\dfrac{55\times100}{158}=34.8\%\)
\(\%mO=\dfrac{mO\times100}{M_{KMnO4}}=\dfrac{64\times100}{158}=40.5\%\)
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