Heavy water (D2O): molar mass and isotopic composition (D2O has molar mass 20 g/mol (each D ≈ 2 u, O = 16 u). Used as moderator and tracer; higher)
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D2O has molar mass 20 g/mol (each D ≈ 2 u, O = 16 u). Used as moderator and tracer; higher boiling/freezing than H2O.
What each symbol means
| Symbol | What it stands for |
|---|---|
| D | Deuterium (²H), mass ≈ 2 u |
| D2O | Heavy water, ~20 g/mol |
| H2O | Ordinary water, ~18 g/mol |
When to use this
Approximate atomic masses as used in JEE (D = 2, O = 16).