Question

One mole of $CO_2$ contains

• A. $ 3\,g $ atoms of $ C O _ 2 $
• B. $ 18.1\times 10^{23} $ molecules of $ C O_{2 } $
• C. $ 6.02\times 10^23 $ atoms of $ O $
• D. $ 6.02\times 0^ {23} $ atoms of $ C $

Answer 1

Answer: (D)

One mole $=6.02 \times 10^{23}$ molecules/atoms/ions.
$\because C O_{2}$ molecule has one $C$ and two oxygen atoms.
$\therefore $ contains $6.023 \times 10^{23}$ atoms of $C$ and $6.023 \times 10^{23}$ molecules of $O_{2}$.