Which of the following best describes spectator ions? A. that do not participate in the reaction B. lons made when compounds dissolve in water C. that are made of a single element D. Ions that combine to form a precipitate

A. that do not participate in the reaction

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)