Stimate the cost of operating labor (col), the cost of utilities (cut), and the cost of manufacturing (comd) for the ethylbenzene process given in project b.2 of appendix b. you must do problem 7.22 in order to estimate comd

Ido not understand. 

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

Ithink about 50 % of an original isotope's number of atoms remain