Question

Radius of an iron sphere is 0.21cm if the density of iron is 7.80g calculate the mass

Answer 1

since,density=mass/volume
D=M/V
7.8=3M/4pi (r)3
7.8*3*0.21*0.21*0.21*3.14*4/3=M
M=0.9027g

Answer 2

Mass=0.3027024gm.because density=mass/volume.so, we need volume of sphere.