Why is boiling point of deuterium oxide different from water?

Answer 1

Standard water (hydrogen oxide) is H2O. We get deuterium oxide by changing the two hydrogen atoms to deuterium atoms. These are hydrogen atoms with an extra particle, a neutron. Since hydrogen comprises 1 proton, deuterium being 1 proton plus 1 neutron is roughly twice as heavy. This is significant on a chemical behavior scale. It is an exception to the rule that changes in nuclear weight do not affect chemistry.

Answer 2

Deuterium oxide, or heavy water, has a different boiling point compared to regular water because the presence of deuterium atoms increases the molecular weight of the compound. This results in stronger bonds within the heavy water molecules, requiring more energy to overcome and reach the boiling point. As a result, heavy water boils at a higher temperature than regular water.