Posted by Heather on Thursday, September 11, 2008 at 7:15am.
Average density of a coppercoated iron BB is 8.00g/mL. If the density for copper is 8.92 g/mL, and the density for iron is 7.43g/mL, what is the percentages of copper and iron in a BB?

Chemistry  bobpursley, Thursday, September 11, 2008 at 8:44am
Notice that mass is density*volume.
total mass=massiron*densityiron*volume + masscopper*densitycopper*volume
Now, divide by total mass
1= fractioniron*densityiron*volume/mass + fractionCu*densityCu*volume/mass.
now note that volume/mass=1/avgdensity
and that fractionCu=1fractioniron
That should be enough for you to grunt through the algebra.
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