Question

The weight of a molecule of the compound C₆₀H₁₂₂ is _______.

(A) 1.4 x 10^-21 g 

(B) 1.09 x 10^-21 g 

(C) 5.025 x 10²³ g 

(D) 16.023 x 10²³ g

Answer 1

Correct option: (A) 1.4 x 10^-21 g 

Molecular weight of C₆₀H₁₂₂

= 12 x 60 + 122 x 1

= 720 + 122

= 842

∵ 6 x 10²³ molecules = 842 g

1 molecule = \(\cfrac{842}{6\,\times 10^{23}}\) 

= 140.33 x 10^-23

= 1.4 x 10^-21 g