\(a.n_{CaCl_2}=0,1\left(mol\right)\\ CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl\\ n_{AgCl}=2n_{CaCl_2}=0,2\left(mol\right)\\ \Rightarrow m_{AgCl}=0,2.143,5=28,7\left(g\right)\\ b.n_{Ca\left(NO_3\right)_2}=n_{CaCl_2}=0,1\left(mol\right)\\ \Rightarrow CM_{CaCl_2}=\dfrac{0,1}{0,1}=1M\)