Question

The mass of one molecule of carbon dioxide is:

• A. $26.49\times {10}^{24}g$
• B. $44g$
• C. $7.30\times {10}^{-23}g$
• D. $22g$

Answer 1

Answer: (C)

$7.30\times {10}^{-23}g$

As we know,

No. of molecules = $No.ofmoles\times AvogadroNumber$

No. of moles $=\frac{No.ofmolecules}{Avogadronumber}$

Atomic Mass of $C=12u$

Atomic Mass of $O=16u$

Molecular Mass of $C{O}_2=12+(2\times 16)=44u$

Mass of One molecule of $C{O}_2=\frac{44}{6.023\times {10}^{23}}$

= $7.30\times {10}^{-23}g$

So, the correct option is $C$