Question

Почему дейтерийлная вода D2O тежёлая вода

Answer 1

Потому что она тяжелее обычной (H₂O) воды.
А тяжелее потому что молярная масса тяжёлой воды больше молярной массы обычной:
M(D₂0)=20 г/моль
M(H₂O)=18 г/моль

Answer 2

Why is deuterium oxide (D2O) called heavy water?

Deuterium oxide (D2O), also known as heavy water, is called "heavy" because it contains a larger amount of the isotope deuterium compared to regular water (H2O). Deuterium is an isotope of hydrogen with an atomic mass of 2, which is twice the mass of the common hydrogen isotope, protium, with an atomic mass of 1. This extra neutron in deuterium makes heavy water denser than regular water, hence the term "heavy water."

Key Points: - Deuterium oxide (D2O) is called "heavy water" because it contains a larger amount of the isotope deuterium compared to regular water (H2O). - Deuterium is an isotope of hydrogen with an atomic mass of 2, which is twice the mass of the common hydrogen isotope, protium, with an atomic mass of 1.

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