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massa Al = 2,7 gr
mol Al = 2,7 gr / 27 gr/mol = 0,1 mol
perbandingan koefisien reaksi Al : Al2(SO4)3 : H2 = 2 : 1 : 3
mol Al2(SO4)3 = 1/2 x 0,1 mol = 0,05 mol
mol H2 = 3/2 x 0,1 mol = 0,15 mol