CHM1 16 Van't Hoff Equation Collection

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If we determine the equilibrium constant, K_T1 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, K_p, 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.

Predict the effect on the O₂ concentration when the temperature of the equilibrium system is increased.
Use the Van't Hoff equation to estimate the equilibrium constant for this reaction at 1260 K.

Subpages (1): Example 6