申論題

3. You have collected a tissue specimen that you would like to preserve by freeze drying. To ensure the integrity of the specimen, the temperature should not exceed -5.0 C. The vapor pressure of ice at 273.16 K is 624 Pa. What is the maximum pressure at which the freeze drying can be carried out? The molar enthalpy changes of fusion of ice and vaporization of water are 6.01 and 40.66 kJ/mol, respectively. (20%)