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CBSE Class 11-science Answered

determine molecular formula of am oxide of iron in which mass% of iron is 69.9 & of oxygen is 30.1
Asked by | 12 Jul, 2008, 09:24: PM
answered-by-expert 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 | 15 Jul, 2008, 03:06: PM
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