Mr(MnO2) =55 + 16*2 = 87
W(O) = Ar(O) * n / Mr(MnO2) *100% = 16*2 / 87 *100% = 36,7%
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Mr(MnO2) =55 + 16*2 = 87
W(O) = Ar(O) * n / Mr(MnO2) *100% = 16*2 / 87 *100% = 36,7%