Question #bde5e

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David Y.
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%#

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