Calculate the average atomic mass of argon from the following data :
Calculate the average atomic mass of argon from the following data :
| Isotope | Isotopic mass (g mol-1) | Abundance |
| 36Ar | 35.96755 | 0.337% |
| 38Ar | 37.96272 | 0.063% |
| 40Ar | 39.9624 | 99.600% |
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Average atomic mass of argon (Ar) =
\(\frac{(At.\,mass\,of\,^{36}Ar \times \%Abundance)+(At.\,mass\,of\,^{38}Ar \times \%Abundance)+(At.\,mass\,of\,^{40}Ar \times \%Abundance)}{100}\)
\(=\frac{(35.96755u \times 0.337)+(37.96272u\times 0.063)+(39.9624u \times 99.60)}{100}\)
= 39.947 g mol-1
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