Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(iv) oxide: you add 40.7 g of mno2 to a solution containing 42.7 g of hcl.(a) what is the limiting reactant? (b) what is the theoretical yield of cl2? (c) if the yield of the reaction is 81.5%, what is the actual yield of chlorine?

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."