Some of the physical properties of \(\mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{D}_{2} \mathrm{O}\) are as follows:

Account for the differences. (D is a symbol often used for \({ }^{2} \mathrm{H}\), the deuterium isotope of hydrogen.)

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Property Density at 20C (g/mL) Boiling point (C) Melting point (C) AHvap (kJ/mol) AHus (kJ/mol) HO 0.997 100.00 0.00 40.7 6.01 DO 1.108 101.41 3.79 41.61 6.3