Question

calculate the mass of 1 molecule of benzene

Answer 1

Mass of 1 mole of Benzene (C₆H₆) = 78 grams (molecular mass)

But we know, 1 mole of Benzene contains "Avogadro number" of molecules.

                                                             → 6 x 10²³ molecules

Hence we can say that 6 x 10²³ molecules of Benzene weigh 78 grams.

Thus, 1 molecule of Benzene will weigh 78/(6 x 10²³) grams

                                                          → 1.3 x 10⁻²² grams


Hope it helps

Answer 2

 molar mass = 78.114 g/mol 

The mass of one mole ( = 6.02 x 10^23 molecules) is 78.114 g 

the mass of one molecule is 78.114 / 6.02 x 10^23=1.30 x 10^-22 g