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2Al2O3 ==> 4Al + 3O2
mol Al2O3 = massa/mr = 240/102 = 2,35 mol
mol O2 = koefisien O2/koefisien Al2O3 x mol Al2O3
mol O2 = 3/2 x 2,35 = 3,525 mol
diukur STP, maka volume gas yang dihasilkan
V = mol x 22,4 = 3,525 x 22,4 = 78,96 L ≈ 79 L