Problem #1: Carbon
mass number
|
exact weight
|
percent abundance
|
12
|
12.000000
|
98.90
|
13
|
13.003355
|
1.10
|
To calculate the average atomic weight,
each exact atomic weight is multiplied by its percent abundance (expressed as a
decimal). Then, add the results together and round off to an appropriate number
of significant figures.
This is the solution for carbon:
(12.000000)
(0.9890) + (13.003355) (0.0110) = 12.011 amu
Problem #2: Nitrogen
mass number
|
exact weight
|
percent abundance
|
14
|
14.003074
|
99.63
|
15
|
15.000108
|
0.37
|
This is the solution for nitrogen:
(14.003074)
(0.9963) + (15.000108) (0.0037) = 14.007 amu
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