A) 20, 80
B) 30, 70
C) 10, 90
D) 15, 85
Correct Answer: A
Solution :
[a] Let the percentage of isotope with atomic wt. 10.01 = x |
Percentage of isotope with atomic wt. |
Average atomic wt. \[=\frac{{{m}_{1}}{{x}_{1}}+{{m}_{2}}{{x}_{2}}}{{{x}_{1}}+{{x}_{2}}}\] |
or Average atomic wt. |
\[=\frac{x\times 10.01+(100-x)\times 11.01}{100}\] |
\[10.81=\frac{x\times 10.01+(100-x)\times 11.01}{100}\Rightarrow x=20\] |
\[\therefore \] % of isotope with atomic wt. 10.01 = 20 |
% of isotope with atomic wt. 11.01 = 100 - x = 80. |
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