Question

The weight of a molecule of $C_{60}{H}_{22}$ is:

• A. $1.09\times {10}^{-21}\text{g}$
• B. $1.23\times {10}^{-21}\text{g}$
• C. $5.025\times {10}^{-23}\text{g}$
• D. $16.023\times {10}^{-23}\text{g}$

Answer 1

The correct option is B $1.23\times {10}^{-21}\text{g}$

Mass of $6.023\times {10}^{23}$ molecules of $C_{60}{H}_{22}=742\text{g}$
Mass of 1 molecule of $C_{60}{H}_{22}=\frac{742}{6.023\times {10}^{23}}=1.23\times {10}^{-21}\text{g}$