What is the density of an object whose mass is 142.5 g and whose volume is 7.5 ml?

How do you convert 4 mmol of bromobenzene to ml?

Correct relationship between molecular formula and empirical formula

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?