A)Suppose that Li2O is added as an impurity to CaO. If the Li+substitutes for Ca2+, what kind of vacancies would you expect to form? How many of these vacancies are created for every Li+added?(b)Suppose that CaCl2is added as an impurity to CaO. If the Cl-substitutes for O2-, what kind of vacancies would you expect to form? How many of the vacancies are created for every Cl-added?

that's what i got you can count the number of atoms

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.