Question

The number of nucleons present in $2.4$ mL of $C{O}_2$ at STP are:

• A. $2.48\times {10}^{24}$
• B. $1.28\times {10}^{21}$
• C. $2.48\times {10}^{21}$
• D. $1.28\times {10}^{24}$

Answer 1

Answer: (C)

$2.48\times {10}^{21}$

Nucleons are the proton and the neutron, which are the constituents of the atomic nucleus.

For each molecule of $C{O}_2$ there is 1 atom of $C$ which has $6protons$ and $6neutrons$

2 atoms of $O$ which has $8protons$ and $8neutrons$

Total number of nucleons in 1 molecule of $C{O}_2=12+32=44$

Moles of $C{O}_2$ in $2.4ml=\frac{2.4\times {10}^{-3}}{22.4}=1.07\times {10}^{-4}mol$

Number of nucleons $=44\times 1.07\times {10}^{-4}\times 6.023\times {10}^{23}=2.48\times {10}^{21}atoms$