From the options, the reaction that shows the conservation of atoms is 4Fe + 302 → 2Fe2O3.
What is conservation of atoms?
The idea of the conservation of atoms is that the number of atoms on the right hand side is equal to the number of atoms on the left hand side.
In this case, we have to a reaction equation which is balanced which is 4Fe + 302 → 2Fe2O3.
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