Calculate the number of moles of gold present in an engagement ring that is made of 4 carats of gold, Au. (1 carat is equivalent to 0.25g). (RAM Au: 197)

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?