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Mol = 3,01 x 10^22 / 6,02 x 10^24
Mol = 0,5 x 10^-2 = 5 x 10^-3
Mol = Massa Fe / Ar Fe
5 x 10^-3 = Massa Fe / 56
Massa Fe = 5 x 10^-3 x 56
Massa Fe = 0,28 gram...
Maaf Kalo ada yg salah ya. :D