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Quakersoatmeal9
15.04.2020 •
Physics
Describe how to use the information from the mass spectrum to determine the average atomic mass of the element.
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Ответ:
Explanation:
Before answering the question, we introduce two definitions:
- Isotope: isotopes of the same element are atoms of the same element having same number of protons but different number of neutrons --> this means that they have same atomic number, but different atomic mass
- Relative abundance: each isotope is present with a certain relative abundance, which gives the % of that isotope compared to the total.
When we know the mass spectrum of a certan element, it means we know the relative abundance of each isotope, together with the atomic mass of the isotope.
For instance, we can have:
- Isotope 1 with atomic mass
and relative abundance
, where
is a fraction in the form
(it gives the percentage of that isotope relative to the total)
- Isotope 2 with atomic mass
and relative abundance ![r_2](/tpl/images/0602/6219/2545d.png)
... and so on
So, the average atomic mass of the element is calculated with the formula:
So, basically by calculating the sum of the product of each atomic mass by its relative abundance.
Ответ: