At equilibrium, the free energy change. Delta G, of any system is zero: So. unde

Question

At equilibrium, the free energy change. Delta G, of any system is zero: So. under equilibrium conditions, this equation can be rearranged as This form of the equation can be used to calculate the temperature at which the equilibrium occurs. Since a phase change represents an equilibrium between two phases, melting and boiling points can be calculated by this method. Glacial acetic acid is the concentrated form of acetic acid, the acid in vinegar. The term "glacial" refers to the appearance of the solid form. which resembles glacial ice. What is the melting point of this compound, in degrees Celsius, based on its thermodynamic data shown here? Express the melting point numerically in degrees Celsius. Based on the following thermodynamic data, calculate the boiling point of ethanol in degrees Celsius. Express the boiling point numerically in degrees Celsius.

Explanation / Answer

Part A; T = delH/delS = 24.32*1000 J/mol /{83.93 J/mol/K} = 289.76K Celsius = 289.76 - 273.15 = 16.62 Celsius Part B delH = -235.1 - (-277.7) = 42.6 kJ/mol delS = 282.6 - 160.6 = 122 J/mol/K T = 42.6 *1000/ (122) = 349.18K T (Celsius) = 76.03 Celsius

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