If we determine the equilibrium constant, KT1 for a reaction at one temperature, T1, and also its `DeltaH°`, we can thenestimate the equilibrium constant at a second temperature, T2, using the Van't Hoff equation:
`lnK = -(DeltaH°)/(R) (1)/(T) + (DeltaS°)/(R)`
Example 6:
Sulfur dioxide reacts with oxygen to form sulfur trioxide. The equilibrium constant, Kp, for this reaction is 0.365 at 1150 K.
`2 SO_2 (g) + O_2 (g) -> 2 SO_3 (g)`
The standard enthalpy change for this reaction (`DeltaH°`) is -198 kJ/mol.
Subpages (1): Example 6