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masa molowa Al - 27 g/mol
masa molowa O2 - 32 g/mol
masa molowa Al2O3 - 102 g/mol
27g Al - 102 g Al2O3
24g Al - x g Al2O3
(24g * 102g) : 27g = 90,67g Al2O3
90,67g * 65% = 58,9g Al2O3