Indique a massa presente nas seguintes amostras :a) 1,5 mol de átomos de ferro (MM- Fe+ 56/gmol
B) 3 mol de átomos de N2. /9/mm-N =14g/mol)
c) 0,2 mol de átomos de C3H6O2.(MM-C=12g/mol/ H=1g/mol/O=16g/mol)
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