[adkinsjr]

I need to find the number of water molecules in of

The density of water at 4 degrees C is given as therefore contains at that temperature.



If there is anything wrong with the latex, I will be editing it.

I'm not sure how to relate the number of molecules to the number of moles. I know how to find the number of atoms of any element. So could I just find the number of hydrogen atoms in 1 mole of $$H_2O }[/img] and then divide that number by 2? Or I guess it would just be easier to find the number of oxygen atoms in 1 mole. 1 water molecule contains 1 oxygen atom.

[adkinsjr]

Actually, I think it's simplier than I though. The number doesn't seem to apply exclusively to atoms. So I should be able to use the conversion factor  right?

[cth]

Yes, simply multiply by N_A the mole number you have to get the number of molecules.

One mole of something (it could be anything like atoms, molecules, cars, stars,...) is always defined as containing N_A objects. Just like a dozen is defined as containing 12 objects.