How many molecules are in
3c2h3o

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.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a