Question

iron will have increase or decrease in mass if it is exposed to air​

Answer 1

Answer:

Reaction of iron with air

Iron metal reacts in moist air by oxidation to give a hydrated iron oxide. This does not protect the iron surface to further reaction since it flakes off, exposing more iron metal to oxidation. This process is called rusting and is familiar to any car owner.

Answer 2

Increases.

When iron or any other metal oxidizes, oxygen from the air combines with the iron to make iron oxide or rust. So the weight increases, due to the increased weight of oxygen which has combined with the iron.

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