In this question, what are we really being asked? We are being asked about the number of moles there in 2.0x10^22 molecules of H2O.
We are going to use the formula,
Number of moles = Number of molecules / Avogadro's number
We have the number of molecules: 2.0 x 10^22
Avogadro's number: 6.02 x 10^23
Now we will plug in our information in a scientific calculator:
(2.0 x 10^22) / (6.02 x 10^23) = 0.03 moles is our answer.
