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Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90%...

Chemistry
JAMB 1997

Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?

  • A. 16.0
  • B. 16.2
  • C. 17.0
  • D. 18.0
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Correct Answer: Option B
Explanation

816O, 818O
90% 10%
R.A.M = (90)/(100) x 16 + (10)/(100) x 18 = 14.4 + 1.8 = 16.2

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