Teaching DSSSB TGT Mock Test 2025 General Science Chemistry Basic Concepts of Chemistry

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?

1

17.5 u

2

17 u

3

16 u

4

16.5 u

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