Unformatted text preview: Note that we are assuming that the iron atoms occupy the same total volume when mixed with the aluminum atoms as they would if they were alone. This may or may not be true, but as is often the case in science, we here have to make a simplifying assumption—indeed, we can’t do the problem without making this assumption. 2000 cm 3  8 g iron  1 kg = 16 kg iron  1 cm 3  1000 g Now we need to subtract this mass from the total mass to find the aluminum mass. 20 kg – 16 kg = 4 kg Since this is not one of the answer choices, we should try converting it to g. 4 kg  1000 g = 4000 g = 4 x 10 3 g  1 kg...
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This document was uploaded on 11/04/2011 for the course CHEM 105 at BYU.
 Fall '07
 Macedone
 Atom, Alloy

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