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## Homework Statement

Germanium forms a substitutional solid solution with silicon. Compute the weight percent of germanium that must be added to silicon to yield an alloy that contains 2.43e21 Ge atoms per cubic centimeter. The densities of pure Ge and Si are 5.32 and 2.33 g/cm3 respectively.

## Homework Equations

not sure

## The Attempt at a Solution

calculate Ge weight per atom:

72.6/6.0221418e23 = 1.20555e-22

calculate g/cm3 germanium in alloy

1.20555e-22*2.43e21 = 2.92949e-1

I'm not sure what to do next.