If NaCl is doped with 10⁻⁴ ~mol % of SrCl ₂ , the concentration of cation vacancies will be: ( N _A=6.02 10²³ ~mol ⁻¹ )

Step-by-step solution

Since each Sr ⁺⁺ ion provides one cation vacancy, hence Concentration of cation vacancies = mole % of SrCl ₂ added aligned & =10⁻⁴ mole % & = 10⁻⁴ 100 6.023 10²³ & =6.023 10¹⁷ ~mol ⁻¹ aligned Related Theory Doping is the process of adding impurities to intrinsic semiconductors to alter their properties. When an intrinsic semiconductor is doped with Trivalent impurity it becomes a P-Type semiconductor. The P stands for Positive, which means the semiconductor is rich in holes or Positive charged ions.