When iron rusts and forms iron oxide, the iron oxide has more mass than the iron. Which statement correctly explains this difference in mass?(1 point)

Question

Responses

There are more iron atoms in iron oxide than in pure iron.
There are more iron atoms in iron oxide than in pure iron.

Iron oxide has oxygen atoms, and pure iron does not.
Iron oxide has oxygen atoms, and pure iron does not.

The iron atoms in iron oxide have more mass than pure iron.
The iron atoms in iron oxide have more mass than pure iron.

The oxygen atoms in iron oxide have more mass than the iron atoms in pure iron.

Answer 1

The correct statement that explains the difference in mass when iron rusts and forms iron oxide is:

Iron oxide has oxygen atoms, and pure iron does not.

When iron reacts with oxygen to form iron oxide (rust), it incorporates oxygen into the compound, which adds to the overall mass of the resulting iron oxide compared to the original iron alone.