What do the symbols in parenthesis indicate? cacl2(aq) + 2agno3(aq) → ca(no3)2(aq) + 2agcl(s) the catalyst used in the reaction the number of atoms of each reactant and product the physical state of each reactant and product the number of units of each reactant and product

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .