Question

The weight of one molecule of a compound $C _{60} H _{122}$ is

• A. $1.2 \times 10^{-20} \,g$
• B. $5.025 \times 10^{23} \,g$
• C. $1.4 \times 10^{-21} \,g$
• D. $6.023 \times 10^{23}\, g$

Answer 1

Answer: (C)

The molecular weight of
$C _{60} H _{122}=60 \times 12+122=720+122=842$
The weight of one molecule of $C _{60} H _{122} $
$=$ molecular wt. of compound/Avogadro number
$=\frac{842}{6.023 \times 10^{23}} $
$=1.4 \times 10^{-21}\, g$