1. The problem statement, all variables and given/known data Germanium forms a substitutional solid solution with silicon. Compute the number of germanium atoms per cubic centimeter for a germanium-silicon alloy that contains 15 wt% Ge and 85 wt% Si. The densities of pure germanium and silicon are 5.32 and 2.33 g/cm3, respectively. 2. Relevant equations I'm not sure on these. I will put the ones I think are applicable. C'1=(C1 A2)/((C1 A2)+(C2 A1)) p (avg) = ((C'1 A1)+(C'2 A2))/((C'1 A1/p1)+(C'2 A2/p2)) C = weight percent = wt% C' = atomic percent p = density A = atomic weight 3. The attempt at a solution I can put the numbers in to get the atomic percents and the density of the alloy. I calculated 6.389 atomic% Ge and 93.611 atomic% Si. For the density of the alloy, I got 2.5445 g/cm3. The only problem is that I don't know how to get the number of Ge atoms in one cubic centimeter. How do I get there from where I am?