Here we have to get the number of molecules present in 3C₂H₃O
There are 1.806×10²⁴ number of molecules in 3C₂H₃O
As per Avogadro there are 6.023×10²³ number of molecules are present in per mole of a compound.
In this compound there are 3 moles of the compound thus total number of molecules will be 3×6.023×10²³ = 1.806×10²⁴ .
Thus the number of molecules present in 3 moles of C₂H₃O compound is determined.