\(1.\\ a)M_x=\dfrac{1}{0,01}=100g/mol\\ b)n=\dfrac{1,2395}{24,79}=0,05mol\\ M=\dfrac{3,2}{0,05}=64\\ 2.\\ n_{Al}=\dfrac{2,7}{27}=0,1mol\\ n_{HCl}=\dfrac{14,6}{36,5}=0,4mol\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\\ \Rightarrow\dfrac{0,1}{2}< \dfrac{0,4}{6}\Rightarrow HCl.dư\\ n_{H_2}=\dfrac{0,1.3}{2}=0,15mol\\ V_{H_2}=0,15.24,79=3,7185l\)