chem 111

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?

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asked by Heather
  1. 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.

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    posted by DrBob222
  2. well i did the problem to my understanding and I ended up getting this: fraction for for Fe: .004 and for Cu: .006?? and he said it should equal 1?? where did I go wrong it equals .01??

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    posted by Heather
  3. I was wondering if you could tell me if the answer is Fe: 40% and Cu: 60%???

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    posted by Heather
  4. In my explaination, I used fraction or decimal percents, not percents. a fraction percent of .4 is 40 percent.

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