Number of molecules of water in 6 moles

I mol of anything is 6.02 * 10^23 (in this case molecules of water)

6 mols of water = x

1/6 = 6.02 * 10^23 / x Cross multiply

x = 6 * 6.02 * 10^23

x = 3.612 * 10^24 molecules in 6 mols of water