Respuesta :
Answer:
238 amu
Explanation:
(234 * 0.0001) + (235 * 0.0071) + (238 * 0.9928) = 238
The average atomic mass of uranium is 237.98 amu.
Given:
Three isotopes of uranium element.
To find:
The average atomic mass of uranium.
Solution:
- Uranium-234
Mass of uranium-234 isotope = 234 amu
Percentage of the abundance of uranium-234 isotope = 0.01%
Fractional abundance of uranium-234 isotope = 0.0001
- Uranium-235
Mass of uranium-235 isotope = 235 amu
Percentage of the abundance of uranium-235 isotope = 0.71%
Fractional abundance of uranium-235 isotope = 0.0071
- Uranium-238
Mass of uranium-238 isotope = 238 amu
Percentage of the abundance of uranium-238 isotope = 99.28%
Fractional abundance of uranium-238 isotope = 0.9928
The average atomic mass of uranium will be given by:
[tex]M=\sum [\text{Mass of an that isotope}\times \text{Fractional abundance of isotope}]\\\\=234amu\times 0.0001+235amu\times 0.0071+238amu\times 0.9928\\\\=237.9783 amu\approx 237.98 amu[/tex]
The average atomic mass of uranium is 237.98 amu.
Learn more about average atomic mass here:
brainly.com/question/17338557?referrer=searchResults
brainly.com/question/860326?referrer=searchResults
