Mr(Fe(NO3)3) = 56 + 14*3 + 16*9 = 242
W(O) = Ar(O) * n / Mr(Fe(NO3)3) *100% = 16*9 / 242 *100% = 59,5%
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Mr(Fe(NO3)3) = 56 + 14*3 + 16*9 = 242
W(O) = Ar(O) * n / Mr(Fe(NO3)3) *100% = 16*9 / 242 *100% = 59,5%