When an iron nail reacts with oxygen and water in air , it rusts . what happen then to the total mass of the nail ?
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Explanation:
When an iron nail starts rusting, the surface of the nail is being attacked by ambient air/moisture. The reaction results in the oxidation of iron to form rust. Rust is a compound of iron with the rough formula Fe2O3.nH2O. Rust is a solid, and will stick on to the iron nail unless it is scraped off.
Clearly, the mass of the iron nail will increase upon the formation of rust on the surface, because of the increased mass of Fe2O3.nH2O over Fe, by roughly 60%, assuming n=1 in the formula for rust.
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