С2H6 + Cl2 (hn) = C2H5Cl + HCl 2C2H5Cl + 2Na = 2NaCl + C4H10 n(C2H6)=V/Vm=17.92/22.4=0.8 mol n(C4H10)=1/2n(C2H6)=0.4 mol m=n*M=0.4*58=23.2 g