determine molecular formula of am oxide of iron in which mass% of iron is 69.9 & of oxygen is 30.1

Asked by  | 12th Jul, 2008, 09:24: PM

Expert Answer:

ELEMENTS       ATOMIC MASS %     RELATIVE       SIMPLE                   WHOLE  
                                                                       No. of             no ratio                         no ratio
                                                                         Moles
 
 
Fe                          56                            69.9      69.9/56         1.24/1.24                  1X 2=2     
 
 
 
O                           16                             30.1     30.1/16        1.88/1.24                   1.5 x2=3
 
 
 
 
So the molecular formula is Fe2O3                                                         

Answered by  | 15th Jul, 2008, 03:06: PM

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