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7=n.56
n=0,125mol
X=n.L
X=0,125 x 6,02x10^23
X=0,7525 x 10^23 atom Fe
Mg 3X:
3X=2,2575 x 10^23 atom Mg
2,2575 x 10^23 = n. 6,02 x10^23
n=0,375
Massa=0,375 . 24=9 gram (C)