Molecules of an ideal gas is composed of a large number of identical molecules moving in random directions, separated by distances that are large compared with their size.
21.69mL - 20.70mL = .99mL Fe
7.8 g / .99 mL = 7.9g/mL
Your answer would be 2.Because the matter in the nebula that formed Earth was spinning
Hope this helps! :D
