Homework Help: chemistry

Posted by Tonya on Sunday, February 13, 2011 at 1:29pm.

A bag contains a mixture of copper and lead BB's. The average density of the BB's is 9.87 g/cm^3. Assuming that copper and lead are pure, determine the relative amounts of each kind of BB.

chemistry - DrBob222, Sunday, February 13, 2011 at 2:30pm
Density Pb = 11.4
Density Cu = 8.96
You need to confirm these.
Let x = fraction Pb BBs, then
1-x = fraction Cu BBs.

11.4(x) + 8.96(1-x) = 9.87
Solve for x, then evaluate 1-x.

check my work. Check my thinking.
chemistry - Tonya, Sunday, February 13, 2011 at 3:14pm
What do you do next?
chemistry - DrBob222, Sunday, February 13, 2011 at 3:19pm
Solve for x. After you know x, you can find 1-x. x is lead and 1-x is Cu.

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