The element uranium (U) has three naturally occuring isotopes, 234^U, 235^U, and 238^U. 234^U has an isotopic mass of 234.04 u and a relative abundance of 0.0054%. 235^U has an isotopic mass of 235.04 u and a relative abundance of 0.7204%. 238^U has an isotopic mass of 238.051 u and a relative abundance of 99.2742%. Calculate the average atomic mass of uranium.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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The element uranium (U) has three naturally occuring isotopes, 234^U, 235^U, and 238^U. 234^U has an isotopic mass of 234.04 u and a relative abundance of 0.0054%. 235^U has an isotopic mass of 235.04 u and a relative abundance of 0.7204%. 238^U has an isotopic mass of 238.051 u and a relative abundance of 99.2742%.

Calculate the average atomic mass of uranium.

Expert Solution
Step 1

 The average atomic mass of uranium given by formulas :

Mavg = Mass of isotopes* percentage of isotope......= M1X1+M2X2+.........

 

 
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