Posted by Anonymous on .
Given the density of copper 8.96g/mL, zinc 7.14g/mL, and brass 8.36g/mL. What is the fraction of copper and zinc in brass (expressed as %)? Please show me step by step how to calculate this. Thank you.

Chemistry 
DrBob222,
Let x = fraction Cu
Then 1x = fraction Zn

(x*8.96) + (1x)*7.14 = 8.36
Solve for x and 1x and convert fractions to percent.