Do you see how it answers your question?
Yes I see, I just need to:
1. Divide the grams of the substance by its molar mass which gives the moles of a substance.
2. Then you need to multiply this number by Avogadro's number to get the amount of molecules.
1. 2.431463775/18.01528 = 0.1349667491 moles
2. 0.1349667491* 6.022 x 1023
= 8.1276976 x 1022
Thanks for all the help finally got there
Once again cheers.