② The number of hydrogen molecules in the battery is 8× 14+2× 12 = 3, and the number of La atoms is 8× 18 = 1, so the ratio of hydrogen molecules to La atoms in the material is 3: 1, that is to say, it contains/kloc-. The number of H2 adsorbed by La alloy is 0, so the answer is: 3NA；;
(2)① The stronger the nonmetallic nature of an element is, the stronger its electronegativity is, and the nonmetallic nature of O, N, C and H gradually weakens, so the electronegativity of O, N, C and H also gradually weakens. The order of electronegativity of O, N, C and H is O > N > C > H；, so the answer is: O > N > C >.
② There are hydrogen bonds between oxygen atoms and hydrogen atoms in P-nitrophenol hydrate, so the interaction between particles is hydrogen bonds in the process of P-nitrophenol hydrate losing crystal water, so the answer is: hydrogen bonds;
(3) Particles with the same number of atoms and valence electrons belong to isoelectronic bodies, and their structures are similar. Anion and SO42- are isoelectronic bodies, and the outermost electron of each atom in the anion satisfies the 8-electron stable structure, then the ion is NO4 3-, its electron type is:, and the valence electron pair in the ion is 4+ 12 (5+3-4×).