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pertama cari mol Fe, disini satuan ton jgn dirubah..
mol Fe = gr/Mr = 5,6/56 = 0,1 mol
selanjutnya cari mol Fe2O3
mol Fe2O3 = 1/2 x 0,1 = 0,05 mol
gram Fe2O3 = mol x Mr = 0,05 x 56 = 2,8 ton