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 3.43 × 1021 Ge atoms per cubic centimeter. The densities of pure Ge and Si are 5.32 and 2.33 g/cm3, respectively. The atomic weights for germanium and silicon are 72.64 and 28.09 g/mol, respectively.

The answer to tnhe question is;

The weight percent of germanium to be added is 16.146 %.

Explanation:

To solve the question, we note that  the formula to calculate the weight percent of an element in terms of the number of atoms per cm³ in a 2 element alloy is given by,

Where

N = Avogadro's Number

ρ₁ = Density of alloy whose weight percent is sought

ρ₂ = density of the other alloy

N₁ = Number of atoms per cubic centimeter

A₁ = Atomic weight of the element whose weight percent is sought

Therefore

= 16.146 %.

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the answers would be

the first one and the second one