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Classification of Matter
1. Matter and Measurements / Classification of Matter / Problem 3

Rust, Fe2O• H2O(s), is formed by the reaction of iron, Fe(s), and oxygen, O2(g), in the presence of water, H2O(l): 4 Fe(s) + 3 O2(g) + 2 H2O(l) → 2 Fe2O• H2O(s)
Identify the elements and compounds in the reaction.

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