Question
Download Solution PDFWhat is the molecular weight of heavy water?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 20.
CONCEPT:
- Heavy water: It is a form of water that contains only deuterium rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
- Formula: D2O
- Boiling point:101.4 °C
- Molar mass: 20 gm/mole
- Melting point: 3.8 °C
- Density: 1.11 gm/cm3
- Refractive index:1.328
EXPLANATION:
- Heavy water has deuterium(D) which is an isotope of hydrogen.
- While hydrogen has 1 proton and 0 neutrons in its nucleus giving it an atomic weight of 1, deuterium has 1 proton and 1 neutron in its nucleus.
- So deuterium has atomic weight 2.
- So heavy water, which has molecular formula D2O, has molecular mass = 16(for oxygen)+(2× 2)(for two deuteriums)= 20
Last updated on Jul 2, 2025
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