Posted by Heather on Thursday, September 11, 2008 at 3:23pm.
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?

chem 111  DrBob222, Thursday, September 11, 2008 at 3:27pm
Bob Pursley answered this for you earlier. If you have a specific problem, show your work to where you get stuck, explain what you don't understand for the next step and perhaps someone can help you through it.

chem 111  bobpursley, Thursday, September 11, 2008 at 3:45pm
In my explaination, I used fraction or decimal percents, not percents. a fraction percent of .4 is 40 percent.
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