Question: For a solid solution consisting of two elements (designated as 1 and 2), sometimes it is desirable to determine the number of atoms per cubic

For a solid solution consisting of two elements (designated as 1 and 2), sometimes it is desirable to determine the number of atoms per cubic centimeter of one element in a solid solution, N1, given the concentration of that element specified in weight percent, C1. This computation is possible using the following expression:

where
NA = Avogadro's number
ρ1 and ρ2 = densities of the two elements
A1 = the atomic weight of element 1
Derive Equation 4.18 using Equation 4.2 and expressions contained in Section 4.4.

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