Posted by mala on Tuesday, February 16, 2010 at 12:53am.
They probably expect you to compute a "weighted mean" density that is 80.5% of the copper density PLUS 19.5% of the zinc density. However, in the real world, a slightly different value is possible. The intramolecular forces and atom spacing in alloys of metals that dissolve in one another, as in this case, can behave in strange ways.
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