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Fe(OH)₃ + 3HCl ----> FeCl₃ +3 H₂O
HCl = 120 mmol = 0,12 mol
jadi Fe(OH)₃ =1/3 x 0,12 = 0,04 mol
mol = gram/mr
gram = mol x mr...(cari mr Fe(OH)₃ , ya...saya kurang hapal Ar nya)...ntar tinggal masukkan kerumus diatas