Asked by joan
Europium has two stable isotopes, 151 Eu (150.9198 u) and 153 Eu (152.9212 u). The atomic mass given for Eu is 151.9640 u. What is the percent abundance of 153 Eu ??
Answers
Answered by
Anonymous
151.9640 = (150.9198 + x) + (152.9212 + y)
= 150.9198x + (152.92 (1-x))
= 150.9198x + 152.92 -152.92x
= -1.922x + 152.92
151.9640-152.92 = -1.922x = 152.92-152.92
-0.956 = -1.922x
-.0956/-1.922x = -1.922x/-1.922x
0.49739... = x
x = 49.73%
Eu-151 = 49.73%
Eu-153 = 50.27%(since 100%-49.73% = 50.27%)
= 150.9198x + (152.92 (1-x))
= 150.9198x + 152.92 -152.92x
= -1.922x + 152.92
151.9640-152.92 = -1.922x = 152.92-152.92
-0.956 = -1.922x
-.0956/-1.922x = -1.922x/-1.922x
0.49739... = x
x = 49.73%
Eu-151 = 49.73%
Eu-153 = 50.27%(since 100%-49.73% = 50.27%)
Answered by
blah
the setup of the answer is correct. however calculations are wrong
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