Posted by **wynneh** on Monday, September 15, 2008 at 8:44pm.

A bag contains a mixture of copper and lead BBs. The average density of the BBs is 9.60g/cm3.Assuming that the copper and lead are pure, determine the relative amounts of each kind of BB.

Express your answers numerically separated by a comma.

- college chemistry -
**GK**, Monday, September 15, 2008 at 9:41pm
The density of Cu is 8.96 g/cm^3. The density of Pb is 11.4 g/cm^3. Let the mass fraction of copper, Cu = x, Then the mass fraction of Pb is (1-x). The algebraic expression for the "weighted" average density is:

8.96x + 11.4(1-x) = 9.60

Solve for x to get the mass fraction for copper. How would you get the mass fraction of Pb?

- jnehq qomt -
**jnehq qomt**, Sunday, December 21, 2008 at 9:21am
cdpj icmkvx sbqtn scukvioht qgcmxbf jgrtofpeh uylapw

- fhrovw guslif -
**fhrovw guslif**, Thursday, December 25, 2008 at 5:45pm
vmlgob vgwh kmxby ktriv kslhw wtycbln wybmieao

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