Answer:-
2 : 1
Explanation: -
To calculate the required mole ratio, the first step is writing the balanced chemical equation for the formation of Fe2O3 from Fe.
Fe reacts with oxygen to give Fe2O3.
The balanced chemical equation for this reaction is
4 Fe + 3 O 2 --> 2 Fe2O3
Now from the balanced chemical equation we see
There are 4 moles of Fe.
We also see there are 2 moles of Fe2O3.
So their ratio is Fe : Fe2O3 = 4 : 2.
Simplifying by diving by 2, we get Fe : Fe2O3 = 2 : 1
The mole ratio between Fe and Fe2O3 is 2 : 1.