Friday, October 11, 2013

AVERAGE ATOMIC MASS EXAMPLE PROBLEMS

AVERAGE ATOMIC MASS EXAMPLE PROBLEMS

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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