Assuming no mass escapes, explain why the mass of a rusted nail is greater than the mass of a nail before it rusted.
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the nail rusts when exposed to air. Because When exposed to air, oxygen molecules attach to the nail, adding mass. The more mass something has, the more something weighs.
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Answer. Since iron gains oxygen when it rusts, and the iron from the nail won't have gone anywhere, it will weigh more than it did before.
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