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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