The molar mass of hydrogen carbon nitrogen and oxygen is 1008 g mol 1 12011 g mol 1 14007 g mol 1 and 15999 g mol 1. Thus the mass percentage of oxygen and nitrogen is 23 and 77. N3 Lewis Structure Azide Ion Ap Chemistry Molecules Lewis One ammonia molecule has one nitrogen atom bonded to three other hydrogen atoms via covalent bonds. . In the ground state they are arranged in the electron configuration 1s 2 2s 2 2p 1 x 2p 1 y 2p 1 zIt therefore has five valence electrons in the 2s and 2p orbitals three of which the p-electrons are unpaired. It is 5844 g mol 1. The molar mass of sodium chloride is known. Temperature - Enthalpy internal energy and entropy of Nitrogen as an ideal gas. Molecular Weight of Substances - Definition and molecular weight molar mass of some common substances. Let me make it more clear with an example of sodium chloride. The quantity amount of substance is a measure of how many elem...