If 1/2 moles of oxygen combine with Aluminito form A l 2 O 3 then weight of Aluminium metal uin the reaction is (Al= 27) 4Al (s) + 3O 2(g) ® 2Al 2 O 3(s) (1) 27 g (2) 18 g (3) 54 g (4) 40
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