Question

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

Answer 1

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

Answer 2

Answer: 0.69 moles

Explanation:

According to Avogadro's law, 1 mole of every substance contains avogadro's number of particles i.e. $6.023\times 10^{23}$ particles.

1 mole of CO contains $6.023\times 10^{23}$ molecules of CO.

That means $6.023\times 10^{23}$ molecules of CO = 1mole

$4.15\times 10^{23}$  molecules of CO =$\frac {1}{6.023\times 10^{23}}\times 4.15\times 10^{23}=0.69moles$