Question

The weight of a molecule of the compound C₆₀H₁₂₂ is 

(A) 1.4 × 10^–21g 

(B) 1.09 × 10^–21g 

(C) 5.025 × 10²³g 

(D) 16.023 × 10²³g 

Answer 1

The weight of a molecule of the compound C₆₀H₁₂₂ is 1.4 × 10^–21g.

Explanation :-

 Molecular weight of C₆₀H₁₂₂ = 12 × 60 + 122 × 1 = 720 + 122 = 842 

∵ 6 × 10²³ molecule C₆₀H₁₂₂ has mass = 842 g 

∴ 1 molecule C₆₀H₁₂₂ has mass 842 / 6 × 10²³  = 140.333 × 10^–23 g = 1.4 × 10^–21 g.