To find the atomic mass of a particular atom what do you need to know?
The name of the element.........
As a chemist, as a physical scientist, you will always have access to a copy of the Periodic Table. You should have access to a Table in every examination in Chemistry or Physics you will ever sit. You must have such access. Practising chemists will habitually consult the Table in order to work molar and mass equivalence. Of course, you will soon learn by heart the more common elements,