Mr(Mn2O7) = 55*2 + 16 *7 = 222
W(Mn) = Ar(Mn) *n / Mr(Mn2O7) *100% = 55 * 2 / 222 *100% = 49,5%
W(O) = Ar(O) * n / Mr(Mn2O7) *100% = 16 * 7 / 222 *100% = 50,45%
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Mr(Mn2O7) = 55*2 + 16 *7 = 222
W(Mn) = Ar(Mn) *n / Mr(Mn2O7) *100% = 55 * 2 / 222 *100% = 49,5%
W(O) = Ar(O) * n / Mr(Mn2O7) *100% = 16 * 7 / 222 *100% = 50,45%