A substance has a heat of fusion of 61.5 kJ/mol and a heat of deposition of -167

Question

A substance has a heat of fusion of 61.5 kJ/mol and a heat of deposition of -167.4 kJ/mol. What is the heat of sublimation in kJ/mol? -61.5 kJ/mol 61.5 + 167.4 kJ/mol 167.4 kJ/mol 61.5- 167.4 kJ/mol 167.4-61.5 kJ/mol According to the phase diagram given, which of the following statements is WRONG? At the temperature and pressure of point 1, substance W exists as a three-phase equilibrium system. If liquid W is maintained at the pressure of point 4 while the temperature is increased to 80 degree C, the liquid will vaporize. If the W(l) = W(g) system is maintained at the temperature of point 3 while pressure is decreased, more W will vaporize. At the temperature of point 2, a pressure of 500 torr is sufficient to liquify gaseous W. The existence of liquid W at -40 degree C and 500 torr represents the metastable condition of "supercooling."

Explanation / Answer

55. B 56.C

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