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

Average density of a copper-coated 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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