According to the Avogadros constant, 1 mole of an atom is equivalent to 6.02*10^23 molecules
Given the following parameter
Moles of CO2 = 11.945 moles
Convert the moles to molecules
[tex]\begin{gathered} molecules\text{ of CO}_2=11.945moles\times\frac{6.02\times10^{23}molecule}{1mole} \\ molecules\text{ of CO}_2=11.945\times6.02\times10^{23}molecules \\ molecules\text{ of CO}_2=71.9089\times10^{23}molecules \\ molecules\text{ of CO}_2=7.191\times10^{24}molecules \\ \end{gathered}[/tex]Hence the number of molecules present in 11.945 moles of CO2 is 7.191 * 10^24 molecules