There are two isotopes of an unknown element, X-19 and X-21. The abundance of X-19 is 12.01%. Now that you have the contribution from the X-19 isotope (2.282) and from the X-21 isotope (18.48), what is the average atomic mass (in amu) of this element using four significant figures
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Ответ:
The average atomic mass of X is 16.53
Explanation:
Mass of isotope X-19 = 2.282
% abundance of isotope X-19 = 12.01% =![\frac{12.01}{100}=0.1201](/tpl/images/1212/1640/79962.png)
Mass of isotope X-21 = 18.48
% abundance of isotope X-21 = (100-12.01)% =![\frac{100-12.01}{100}=0.8799](/tpl/images/1212/1640/977e1.png)
Formula used for average atomic mass of an element :
Therefore, the average atomic mass of X is 16.53
Ответ:
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