You test l-131 with a half-life of 8 days. You end up with 187.5 g and originally had 750 g. How old is the item?

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

answer carbon and three oxygen atoms;