use formula
D=m/
V
we know the density is 19 000kg/m3, and the volume is 0.02m3. we need to find the mass.
plug in the information
19 300kg/m3= m/
0.02m3
solve
19 300kg/m3=m/
0.02m3
19 300kg/m3 x 0.02m3=m/
0.02m3 x 0.02m3
19 300kg x 0.02=m
386kg=m
the mass of 0.02m3 of gold is 386kg.