ME 2733 Chapter : Ch 4 HW Sol
Document Summary
4. 2 for some hypothetical metal, the equilibrium number of vacancies at 900 c is 2. 3 1025 m 3. If the density and atomic weight of this metal are 7. 40 g/cm3 and 85. 5 g/mol, respectively, calculate the fraction of vacancies for this metal at 900 c. This problem is solved using two steps: (1) calculate the total number of lattice sites in silver, n, using. Equation 4. 2, and (2) take the ratio of the equilibrium number of vacancies given in the problem statement (nv = 2. 3. 1025 m 3) and this value of n. from equation 4. 2. The fraction of vacancies is equal to the nv/n ratio, which is computed as follows: 4. 6 atomic radius, crystal structure, electronegativity, and the most common valence are given in the following table for several elements; for those that are nonmetals, only atomic radii are indicated.
