When ethane, C2H6, reacts with chlorine, Cl2, the main product is C2H5Cl, but other products containing Cl (ch?

You can only start to ask about theoretical yield and actual yield % if you provide data on the quantity of reactants reacting. If you write a balanced equation for the reaction, it is only possible to say that 1 mol ethane will react with 1 mol chlorine to produce 1 mol ethylchloride and 1 mol HCl. It is not possible to do any calculations based on a yield of 160g of the product. The original question must have included m ( or molar) data of the two reactants. It is then necessary to determine any limiting reactant, and then the theoretical yield. From this the % yield is calculated, based on 160g product being formed. Please recheck the question and provide the missing data.