When iron rusts and forms

Question

iron oxide, the iron oxide has
more mass than the iron.
Which statement correctly
explains this difference in
mass? (1 point)
The oxygen atoms in
iron oxide have more
mass than the iron
atoms in pure iron.
Iron oxide has oxygen
atoms, and pure iron
does not.
There are more iron
atoms in iron oxide
than in pure iron.
The iron atoms in iron
oxide have more mass
than pure iron.

Answer 1

The correct statement explaining the difference in mass when iron rusts and forms iron oxide is: Iron oxide has oxygen atoms, and pure iron does not.

When iron rusts, it reacts with oxygen from the environment to form iron oxide (rust), which contains both iron and oxygen atoms, resulting in an increase in mass.