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OpenStudy (anonymous):

Why the mass of a rusted nail would be greater than the mass of the nail before it rusted. Assume that all the rust is still attached to the nail.

OpenStudy (matt101):

Rust happens when a metal oxidizes. Oxidized metal has bonded to nearby O2 in the air. Now that you have oxygen atoms bound to the metal, it has gained some mass - the mass of those oxygen atoms.

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