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Tapi yang FeO nya ga yakin sis .... ;)
FeO -> Mr = 56+16 = 72
Ar/Mr X 100% = 16/72 X 100% =22,22%
Fe2O3 -> Mr = 56.2+16.3 = 160
Ar/Mr X 100% = 48/160 X 100% = 30%
maaf kalau salah:)