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2015-04-22T10:52:38+05:30

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80%  of higher oxide 0.80 gms :   0.64 gm  of metal in the higher oxide.
Thus before oxidation, there is 0.64 gm of metal in the lower oxide.

So there is 0.72 gms - 0.64 gms = 0.08 gms of oxygen in lower oxide.
   and  0.80 - 0.64 = 0.16 gms of oxygen in lower oxide.

   The proportions of metal : oxygen in both oxides are:
                 0.64 : 0.08  =  8 : 1
                 0.64 : 0.16  =  8 : 2

So in the higher oxide there is double the amount of oxygen as compared to the lower oxide.  The content of oxygen that reacts with metal are in the integer ratio :  1 : 2.

3 4 3
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u r in which class?
:) :)
u r in which class?