While searching on the web, I found a great set of easy to understand notes on kinetics by Dr. Jeffery Mack from the California State University Sacramento (CSUS).
Link: Kinetic Notes
Below is a sample of these notes.
mass number
|
exact weight
|
percent abundance
|
12
|
12.000000
|
98.90
|
13
|
13.003355
|
1.10
|
mass number
|
exact weight
|
percent abundance
|
14
|
14.003074
|
99.63
|
15
|
15.000108
|
0.37
|