Question

The number of gram-molecules of oxygen in $6.022\times {10}^{24}$ molecules of $CO$ is:

• A. $10$ gm moles
• B. $5$ gm moles
• C. $1$ gm mole
• D. $0.5$ gm mole

Answer 1

Answer: (B)

$5$ gm moles

Number of oxygen atoms = Number of $CO$ molecules$=6.022\times {10}^{24}$

Number of oxygen molecule $=\frac{1}{2}\times$ Number of oxygen atoms $=3.011\times {10}^{24}$

Number of g-molecule of $O_2$ molecules $=\frac{3.011\times {10}^{24}}{6.022\times {10}^{23}}=5gmmole$