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mol Al = 13,5 gr / 27 gr/mol = 0,5 mol
perbandingan koefisien Al : H2 = 2 : 3
mol H2 = 3/2 x mol Al = 3/2 x 0,5 mol = 0,75 mol
V STP = 22,4 liter/mol
V H2 STP = 0,75 mol x 22,4 liter/mol = 16,8 liter