When I use to work out number of moles I did cv/1000. If the concentration was in cm3, I had to divide by 1000 and if it was in dm3 I didn't.
What I don't get is, I hav a question here which is number of moles for a 25ml of a 0.25m solurion. Now for this wouldnt I still have to divide by 1000 as the volume is in ml except the worked example isnt. Ml is cm3 right?