The formula of nitrobenzene is c6h5no2. the molecular weight of this compound is amu.

The molecular weight of a given compound would simply the sum of the molar weights of each component.

The molar masses of the elements are:

C = 12 amu

H = 1 amu

N = 14 amu

O = 16 amu

where 1 amu = 1 g / mol

Since there are 6 C, 5 H, 1 N and 2 O, therefore the total molecular weight is:

molecular weight = 6 (12 amu) + 5 (1 amu) + 1 (14 amu) + 2 (16 amu)

molecular weight = 123 amu

Therefore the molecular weight of nitrobenzene is 123 amu or which is exactly equivalent to 123 g / mol.