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M Al₂O₃ = 27 × 2 + 16 × 3 = 54 + 48 = 102 g/mol (masa molowa)
proporcje:
1 mol Al₂O₃ ------- 102g Al₂O₃ ------------ 54g Al
3,06g Al₂O₃------------- x g Al
x = (3,06 × 54) : 102
x = ... g Al
;))