Chloroethane is produced by the reaction of ethane with chlorine: \( C_2H_6(g) + Cl_2(g) \rightarrow C_2H_5Cl(g) + HCl(g) \). The molar masses are: \( C_2H_6 = 30.08 \, g \, mol^{-1} \), \( Cl_2 = 70.90 \, g \, mol^{-1} \), \( C_2H_5Cl = 64.52 \, g \, mol^{-1} \), \( HCl = 36.46 \, g \, mol^{-1} \). What is the atom economy for this reaction?