\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ 2Al+3CuCl_2\rightarrow2AlCl_3+3Cu\\ n_A=n_{AlCl_3}=n_{Al}=0,1\left(mol\right)\\ n_B=n_{Cu}=\dfrac{3}{2}.0,1=0,15\left(mol\right)\\ m_B=m_{Cu}=0,15.64=9,6\left(g\right)\\ C_{MddAlCl_3}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)