The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based on a 70.0 kg person. Atomic number Element Mass (kg) 8 oxygen 45.2 6. carbon 12.6 1 hydrogen 7.0 7 nitrogen 2.2 20 calcium 1.3 15 phosphorus 0.78 19 potassium 0.25 16 sulfur 0.18 others 0.60 total 70.0 Nitrogen makes up what fraction of the mass of the human body? 20 calcium 1.3 15 phosphorus 0.78 19 potassium 0.25 16 sulfur 0.18 others 0.60 total 70.0 Nitrogen makes up what fraction of the mass of the human body? fraction of N = Nitrogen makes up what percentage of the mass of the human body? %N = What is the mass of phosphorus in a 47 kg person? mass of P =