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)

Molecular weight of $C_{60}{H}_{122}=60\times 12+1\times 122=842$

$\therefore$ Weight of $1mole$ of $C_{60}{H}_{122}$ molecules $=842g$

$\Rightarrow$ Weight of $6.023\times 10^{23}$ molecules $=842g$

$\Rightarrow$ Weight of 1 molecule $=\frac{842}{6.023\times 10^{23}}=1.4\times 10^{-21}g$