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What percentage of Fe+3 is present in Fe0.93O???????????

What percentage of Fe+3 is present in Fe0.93O???????????

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Grade:12

1 Answers

Chhavi Jain
92 Points
6 years ago
Dear Student, 
 
We know that the compound contains the mixture of Fe2+ and Fe+3  ions , but we don’t know how much each of them is present .
 
The trick we will use to solve this question is charge balancing . 
Let us say that we have 100 moles of the compound .
So, there will be 93 ions of Fe2+  and  Fe3+     and    100 ions of O2- ,
Since the compound is neutral so, the (-2) charge of the oxygen must be balanced with the overall charge of iron ions. 
 
Let us say that we have x  ions of iron (II)  and  y  ions of iron(III) . Now ,
 
 x+y = 93          ….............eq.(i)
also, 
total positive charge = total negative charge 
x (+2)  +  y (+3) = 100 (-2)                       ….............. eq.(ii)
 
solving eq.(i)  and eq.(ii) we get ;
x= 79   and y=14
 
so, we hav 14 Fe3+  ions  and total ions in the compound is 193. So, the percent composition of Fe3+  ions in the compound is = ( 14 Fe3+  ions / 193 total ions ) * 100 
=7.25%
 
 

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