Q.

27 g of Al will react completely with how many grams of oxygen ?

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a

8 g

b

16 g

c

32 g

d

24 g

answer is D.

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Detailed Solution

4 Al +  3O2  →  2 Al2O3At. Wt.  of Al =  27Thus  4 ×  27  g of Al reacts  with 3 ×  32g ofoxygen∴mass ofoxygen that  reacts  with  27  g  of Al  =  3×  324×  27 ×  27=24g.
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