Masses+of+Atoms+and+Moles

__Masses of atoms and moles

Relative Atomic Mass__ Atoms are too small for thier actual atomic mass to be of much use. To make things manageable relative atomic mass is uses instead. This is the mass of a particular atom compared to the mass of an atom of hydrogen, now we use a twelfth of the mass of a carbon atom. The relative atomic mass of an element is just its mass number.

__Moles__ A mole is simply the relative atomic mass of any substance measured out in grams, so 1 mole of carbon would be 12grams. A mole of any substance always contains the same number of atoms.