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A sample of oxygen contains two isotopes of oxygen with masses 16 u and 18 u respectively. The proportion of these isotopes in the sample is 3: 1 . What will be the average atomic mass of oxygen in this sample?

Options

  1. A17.5 u
  2. B17 u
  3. C16 u
  4. D16.5 u

Correct answer

D. 16.5 u

Step-by-step solution

Isotope 1 16 u Isotope 2 18 u Proportion of Isotopes =3: 1 Now, Average atomic Oxygen =(16 3)+(18 1) / 3+1=16.5 u

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