Questions and Answers
- Calculate the change in the molar entropy of a perfect gas when it is compressed isothermally from a pressure of 1 bar to 10 bar.
- Calculate the change in the standard molar entropy of hydrogen chloride, HCl, gas when it is heated from a temperature of 20°C to 30°C. The standard molar constant-pressure heat capacity of hydrogen chloride is 29.1 J K–1 mol–1.
- The standard enthalpy of sublimation of carbon dioxide is 26.2 kJ K–1 mol–1 at 298.15 K. Calculate the standard entropy of sublimation at this temperature.
- The boiling temperature of ethylbenzene is 136 °C. Use Trouton's rule to estimate the enthalpy of vaporization of ethylbenzene at this temperature.
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- Calculate the change in entropy when exactly 1 mol of solid iodine, I2, at a temperature of 360 K is heated at constant pressure to produce liquid iodine at a temperature of 410 K. The constant pressure molar heat capacity of solid iodine is 54.44 J K–1 mol–1 and of liquid iodine is 80.67 J K–1 mol–1. The melting temperature of iodine is 387 K, and the molar enthalpy of fusion of iodine is 7.87 kJ mol–1.
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