Question

Compute the mass of one molecule and the molecular mass of C₆H₆ (benzene). (At. mass of C = 12, H = 1 u).

Answer 1

Molecular weight of C₆H₆ = 6 × 12 + 6 × 1 = 78 g, 

Mass of 1 molecule = 78/6.002 x 10²³ = 12.94 × 10^-23 g = 1.294 × 10^-22 g