$⇒ 0.2$ ગ્રામ $CO_2$ ના મોલ $ = \,\frac{{0.2}}{{44}}\, = \,0.0045$

$1$ મોલ = $6.022 \times 106{23}$ અણુઓ 

$0.0045$ મોલ $= (?)$ અણુઓ

અણુસંખ્યા = $0.0045 \times 6.02 \times 10^{23} = 0.0271 \times 10^{23} = 2.71 \times 10^{21}$ અણુઓ

બાકી વધેલ અણુ = $2.71 \times 10^{21} - 10^{21} = 10^{21}(2.71 - 1) = 1.71 \times 10^{21}$  

$CO_2$ ના મોલ $\, = \,\frac{{1.71\, \times \,{{10}^{21}}}}{{6.022\, \times \,{{10}^{23}}}}\,{\text{ =  0}}{\text{.284 }}\, \times {\text{ 1}}{{\text{0}}^{{\text{ - 2}}}}$

${\text{ =  2}}{\text{.84  }} \times \,{\text{ 1}}{{\text{0}}^{{\text{ - 3}}}}$

$= 0.284 \times 10^{-2} = 2.84 \times 10^{-3}$