Question

determine a massa molar q correspond a 3 mols de c e 8 mols de fe

Answer 1

MM do Carbono = 12g/mol
12 g ---- 1 mol
x  ------- 3 mol

x = 12.3
x = 36 g

Logo,
MM de 3 mol de Carbono = 36 g/mol

MM do Fe = 56 g/mol (valor arredondado)
56 g ---- 1 mol
x --------- 8 mol

x = 56.8
x = 448 g

MM de 8 mol de Ferro = 448 g/mol