What is the calculations?

Other answers are
42g/cm3
12 g/cm3
0.085 g/cm3

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i think? ?

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

answerlinnaeus;