08: Calculate the numbers of Schottky defects per cubic meter in potassium chloride at 250 °C and 500 °C. The energy required to form each Schottky defect is 2.65 eV, while the density for KCI is 1.96 g/cm³. Molecular weights of K and Cl are 39.10 and 35.45 g/mol, respectively. Avogadro's number is 6.023x1023 atoms/mol and Boltzmann's constant is 8.62x10 eV/K. (15)