How many moles are equal to 4.15x10^23 molecules of carbon monoxide?

To be able to determine the number of moles that a certain number of molecules comprises, we simply divide the number of molecules by the Avogadro's number which is equal to 6.022 x 10^23.

n = M/A

where n is the number of moles, M is the number of molecules, and A is Avogadro's number. Substituting the known values,

n = (4.15 x 10^23 molecules) / (6.022 x 10^23 molecules/mol)

Simplifying,

n = 0.689 moles

Answer: 0.689 moles