Milli moles in the tablets

 

A mole is an old idea for the quantity of a substance that dates back before we could detect individual atoms. Then the idea was that if you got a very large number of atoms together, they could be weighed. The difference in mass between different substances would then become apparent. Now this is understood as being linked to the atomic mass number and thus the number of protons and neutrons. It has been fixed so that the atomic mass number in grams is the mass of 1 mole of the substance. Now the atomic mass number of sodium is 23 grams so that is the mass of 1 mole. A milli mole is one thousandth of a mole so would have a mass of 23 milli grams which is as on the notes.