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Question
How is heavy water prepared? Compare its physical properties with those of ordinary water.
Solution
Heavy water can be prepared by exhaustive electrolysis of water. Comparison of physical properties of \[\ce{H2O}\] and \[\ce{D2O}\].
| Property | \[\ce{H2O}\] | \[\ce{D2O}\] | |
| (i) | Molecular mass (g mol–1) | 18.015 | 20.027 |
| (ii) | Melting point (K) | 273.0 | 276.8 |
| (iii) | Boiling point (K) | 373.0 | 374.4 |
| (iv) | Density (298 K) g cm–3 | 1.0000 | 1.1059 |
| (v) | Enthalpy of vapourisation (kJ mol–1) | 40.66 | 41.61 |
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