Question #bde5e

1 Answer
Apr 15, 2015

About 0.7%

The average atomic mass 238.03 can be calculated by the following equation where x is the percentage abundance of U-235 and y is the percent abundance of U-238

238.03=((x)(235.044)+(y)(238.051))/100
and x+y=100

substitution gives

23803=235.044x+238.051(100-x)
23803=235.044x+23805.1-238.051x
-3.007x=-2.099
x=0.7%