The two-state approach to the structure of water is applied to D 2O. Over the temperature range 4° to 100°C, the molar volume of both the close and open-packed structures is estimated to be approximately the same in D2O as in H2O. The enthalpy difference between the two structures is found to be -2915 cal/mole in D2O compared to -2547 cal/mole in H2O, indicating an increase in the hydrogen-bond strength of D2O compared to that of H2O. Estimates of the relaxational thermodynamic parameters of D2O are obtained. Only those which depend on the enthalpy difference exhibit an appreciable change from the corresponding parameters in H2O.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry