The average atomic mass of hydrogen (99% H-1, 0.8% H-2, and 0.2% H-3) is 1.012 amu.
The average atomic mass of hydrogen can be calculated with the following equation:
[tex] A = m_{H-1}\%_{H-1} + m_{H-2}\%_{H-2} + m_{H-3}\%_{H-3} [/tex]
Where:
[tex]m_{H-1}[/tex]: is the mass of protium (H-1) = 1
[tex]m_{H-2}[/tex]: is the mass of deuterium (H-2) = 2
[tex]m_{H-3}[/tex]: is the mass of tritium (H-3) = 3
[tex]\%_{H-1}[/tex]: is the abundance percent of H-1 = 99%
[tex]\%_{H-2}[/tex]: is the abundance percent of H-2 = 0.8%
[tex]\%_{H-3}[/tex]: is the abundance percent of H-3 = 0.2%
The average atomic mass is:
[tex] A = 1*99\% + 2*0.8\% + 3*0.2\% [/tex]
Changing all the percent values into decimal ones, we have:
[tex] A = 0.99 + 2*0.008 + 3*0.002 = 1.012 [/tex]
Therefore, the average atomic mass of hydrogen is 1.012 amu.
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