mass of KMnO4=39+55+4(16)=158gmass of Oxygen in KMnO4=4(16)=64g% mass of Oxygen=mass of Oxygenmass of KMnO4×100%=64158×100%=40.51%\begin{aligned} \textsf{mass of }KMnO_4 &= 39+55+4(16)\\ &= 158g\\ \textsf{mass of Oxygen in }KMnO_4 &= 4(16)\\ &= 64g\\ \\ \%\textsf{ mass of Oxygen} &= \dfrac{\textsf{mass of Oxygen}}{\textsf{mass of }KMnO_4} × 100\% \\ \\ &= \dfrac{64}{158} × 100\% \\ \\ &= 40.51\% \end{aligned}mass of KMnO4mass of Oxygen in KMnO4% mass of Oxygen=39+55+4(16)=158g=4(16)=64g=mass of KMnO4mass of Oxygen×100%=15864×100%=40.51%
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