Please answer the question , it’s multiple choice , the subject is science

  the mississippians were considered to be  horticulturalists, which means they were

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u. s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

Which statement best describes the he properties of iconic compounds ?