When a part rusts it becomes heavier or lighter?

Answer;

It becomes heavier.

- when a part rusts it becomes heavier due to addition of oxygen molecules.

Explanation;

-Rust is iron-oxide (hydrated iron (iii) oxide); a molecule consisting of iron and oxygen.

- When rust forms, the mass of the iron object is increased by the mass of oxygen that has combined with some of the iron and thus gains weight.

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"d.) carbon dioxide and hydrogen sulfide"