The relative atomic mass of boron (which exists in two isotopic forms {}^{10}B and {}^{11}B) is 10.81. What will be the abundance of {}^{10}B and {}^{11}B respectively (consider a sample of 100 atoms)?
- A. 19% and 81% ✓
- B. 81% and 19%
- C. 38% and 62%
- D. 62% and 38%
Correct Answer: A. 19% and 81%
Explanation
Let the fractional abundance of {}^{10}B be x. Therefore, 10x + 11(1-x) = 10.81, which gives x = 0.19. The percentage of {}^{10}B is 19%, making {}^{11}B 81%.
Related questions on Chemistry
- Which one of the following is the correct reactivity series with water?
- Which one of the following metals floats in cold water?
- Which one of the following solutions is <strong>NOT</strong> capable of conducting electricity?
- To help deep-sea divers breathe, they carry cylinders of oxygen mixed with
- Which of the following compounds undergoes/undergo thermal decomposition?