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Answer: 3.44 kg
Explanation: Formula of Aluminium oxide is Al2O3
Molar mass M = 2·26.98 + 3·16 = 101.96 g/mol
m-% of Al is 2·26.98 / 101.96 = 52.92 % = 0.5292
Mass of Al in Aluminium oxide is 0.5292 · 6.50 kg