It is desired to increase the conversion efficiency of a chemical process. would you use multiple reactors in series or in parallel to achieve this? why?

What is the chemical formula for the compound ammonium phosphate? use the list of polyatomic ions and the periodic table to you answer. chemical name chemical formula chemical name chemical formula acetate c2h3o2– nitrite no2– carbonate co32– ammonium nh4+ hypocarbonite co2− cyanide cn– hydrogen carbonate (bicarbonate) hco3– hydroxide oh– chlorite clo2– peroxide o22– hypochlorite clo– phosphate po43– chlorate clo3– hydrogen phosphate hpo42– perchlorate clo4– dihydrogen phosphate h2po4– hydronium h3o+ sulfate so42– permanganate mno4– hydrogen sulfate (bisulfate) hso4– nitrate no3– sulfite so32– a. h4h2po4 b. (nh4)2po4 c. (nh4)3po4 d. (nh4)4po4