Calculating Relative Atomic Mass (R.A.M.)

Calculating Relative Atomic Mass (R.A.M.)

Lets start this off with an example!

Example: Naturally occurring silver is 51.84% silver-107 and 48.16% silver-109. Calculate the relative atomic mass of silver.

r.a.m. (Ag) = (51.84/100 x 107) + (48.16/100 x 109)

= 55.469 + 52.494

=107.96

Now what did we do there? Well I simply calculated 51.84% of 107 (of silver) and 48.16% of 109 (of silver), and added the two answers! What we end up with is 107.96. Round that up to a whole number and the average relative atomic mass of silver is 108.