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Chemistry

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Iron combines with oxygen and water from the air to form rust. If an iron nail were allowed to rust completely, one should find that the rust weighs:

I know the answer is the rust should way more than the nail it came from but can someone explain why please!

  • Chemistry - ,

    Rust is Fe2O3.xH2O
    So rust is the combined weight of the iron nail you started with PLUS the weight of the oxygen added PLUS the weight of the water added.

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