Q1 of 10 Page 46

The atomic mass of Deuterium, an isotope of hydrogen is 2. The atomic mass of oxygen is 16. Then the molecular mass of heavy water formed is

Deuterium is an isotope of hydrogen which has atomic mass 2u. The formula of heavy water is D2O. In heavy water, there are 2 deuterium atoms and 1 oxygen atom. So the molecular mass will be 2×2 + 1×16 = 20.

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