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Another Problem 2
Question:When iron rusts the surface iron reacts with the oxygen in the atmosphere to form iron oxide (the reddish rusty stuff). This is a compound consisting of a 3 : 2 ratio of oxygen and iron atoms. If the rust contains 3216 oxygen atoms, how many iron atoms are there in the rust?
Solution: 2144 atoms
We solve the proportion 3 : 2 = 3216 : x to get x = 2144 atoms.
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