A 13.59 g sample of NaBr contains 22.34% Na by mass. Considering the law of constant composition definite proportions), how many grams of sodium does a 9.85 g sample of sodium bromide contain? a 8 Na An atom has a diameter of 3.00 and the nucleus of that atom has a diameter of 6.00 x 10 . Determine the fraction of the volume of the atom that is taken up by the nucleus. Assume the atom and the nucleus are a sphere. fraction of atomic volume 10 x100 Income Calculate the density of a proton, given that the mass of a proton is 1.0073 amu and the diameter of a proton is 1.71 x 10 m. density 6.173 x1019 Am