NDA 2018 Chemistry question

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?

(A)17·5 u
(B)17 u
(C)16 u
(D)16·5 uCorrect

Answer: (D)

Solution

Average atomic mass \dfrac{3 × 16 + 1 × 18}{3 + 1}\dfrac{66}{4}$ = 16.5\

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Question ID VK-031154