Answer:
The Oxygen atoms in iron oxide have more mass than the iron atoms in pure iron
Explanation:
When iron rusts and forms iron oxide, the iron oxide has more mass than the iron because the iron atoms in iron oxide have more mass than pure iron.
Pure iron contains only iron atoms and nothing else. It is a pure substance.
Iron has an atomic mass of 56 while oxygen has an atomic mass of 16. It follows that iron has a greater mass than oxygen.
However, in iron oxide, iron combines with oxygen to form Fe2O3. There are two iron atoms and three oxygen atoms in Fe2O3.
Three oxygen atoms have a total mass of 48g while two iron atoms has a total mass of 112g.
It the follows that, when iron rusts and forms iron oxide, the iron oxide has more mass than the iron because the iron atoms in iron oxide have more mass than pure iron.
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