Why does a pipe gain mass when it rusts?

Question

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1 point
Matter is created during the chemical reaction.
Oxygen from the atmosphere bonded with the pipe to add mass to the pipe.
It does not gain mass because matter cannot be created.
Because it is going through a physical change.

Answer 1

It does not gain mass because matter cannot be created.

Answer 2

are u sure ?

Answer 3

I apologize for the mistake.

The correct answer is: Oxygen from the atmosphere bonded with the pipe to add mass to the pipe.

When iron in the pipe reacts with oxygen in the air to form iron oxide (rust), the mass of the pipe increases due to the addition of oxygen atoms from the atmosphere.