Bridget Johnson
New member
Van't Hoff studied the temperature dependence of the equilibrium constant, K, using two expressions for the standard Free Energy of a reaction; ?Go = - RT ln K and ?Go = ?Ho - T?So. These can be combined in the form of a linear equation, which allows the calculation of the standard enthalpy and entropy changes of a reaction, based on the change of the equilibrium constant, K, with temperature.
A reaction is carried out at two temperatures, in an ice bath (0.00oC) and in a boiling water bath (100.00oC).
The equilibrium constant, K, is determined at each temperature. At 0.00oC, its value is 9.26E+5. At 100.00oC, its value is 5.49E+5.
From this information, determine the values of the following thermodynamic functions for this reaction. Assume that ?Ho and ?So are independent of temperature, which is generally true over small temperature ranges.
What is the value of ?Ho, in kJ?
What is the value of ?So, in J/K?
A reaction is carried out at two temperatures, in an ice bath (0.00oC) and in a boiling water bath (100.00oC).
The equilibrium constant, K, is determined at each temperature. At 0.00oC, its value is 9.26E+5. At 100.00oC, its value is 5.49E+5.
From this information, determine the values of the following thermodynamic functions for this reaction. Assume that ?Ho and ?So are independent of temperature, which is generally true over small temperature ranges.
What is the value of ?Ho, in kJ?
What is the value of ?So, in J/K?