Răspuns:
a. are 3 leg.cov.simple F
b.A
C. este polara
d A
e.F: niu= 34/17mol=2mol;
1molec..........3at.H
1mol.molec.......3x6,023x10²³atomi
2mol.........x= 6x6,023x10²³at H
f. 1molec........3perechi e
1mol molec---------3x6,023x10²³perechi
2mol......................6x6,023x10²³perechi