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342g - 2 mole Al
25,75g - x mol
x=2*25,75/342=0,151mol
342g - 3 mole S
25,75g - x mol
x=25,75*3/342=0,226 mol
342g - 12 moli O
25,75g - x mol
x=25,75g*12/342=0,904 mol