How many moles of NH3 are in 4.20 x 1024 molecules of it?

Find the mass, in grams, of 5.00*10^23 molecules of f2

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?

Four statements about the development of the atomic model are shown below. a: electrons have wavelike properties. b: atoms have small, negatively charged particles. c. the center of an atom is a small, dense nucleus. d: atoms are hard, indivisible spheres. which order of statements represents the historical development of the atomic model? c-d-a-b c-d-b-a d— в-а — с d-b-c-a