3. What is RAM/RFM/RMM? RAM or Ar: This is the average mass of a large number of atoms of an element (NB an element contains only 1 type of atom) RMM or Mr: This is the average mass of a molecule (this could be an element or compound). It is calculated by adding the RAMs of all the atoms that it has in its formula together. RFM: This is the average mass of a compound molecule (very similar to RMM). It is calculated by adding the RAMs of all the atoms that it has in its formula together.
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7. What is a mole? Moles help to make large numbers more manageable. 1 mole of anything will contain 6x10 23 “bits”. 6x10 23 is known as Avogadro’s number. So 1 mole of sodium will contain 6x10 23 atoms of sodium. 1 mole of oxygen will contain 6x10 23 molecules of oxygen (don’t forget oxygen is O 2 ), which means there are 12x10 23 atoms. You can think of moles like bags of potatoes. It can be time consuming to count a store room of potatoes but if they are in bags and every bag contains 100 potatoes it makes life much easier.
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