$$CuCl_2+2KI\rightarrow CuI+2KCl+\frac{1}{2}I_2\\M(CuI)=190,45\frac{g}{mol}\\n=\frac{m}{M}=\frac{2g}{190,45\frac{g}{mol}}\approx0,0105mol\\ 0,0105mol\cdot\frac{100}{80}=0,013125mol\\n(CuCl_2)=n(CuI)\Rightarrow n(CuCl_2)=0,013125mol\\2n(KI)=n(CuI)\Rightarrow n(KI)=0,013125mol\cdot2=0,02625mol\\M(CuCl_2)=134,45\frac{g}{mol}\\M(KI)=166,0028\frac{g}{mol}\\m=n\cdot M\\m(CuCl_2)=0,013125mol\cdot134,45\frac{g}{mol}\approx1,765g\\m(KI)=0,02625mol\cdot166,0028\frac{g}{mol}\approx4,358g$$