The following reactions occur at 500 K.Arrange them in order of increasing tendency to proceed to completion (least completion $\rarr$ greatest completion).

Question

Quizplus · Accepted Answer

The reaction with the greatest completion will have the largest equilibrium constant (K). From the given reactions, we can write the equilibrium constants as: 
Reaction 1: K = (F1F1F10)/(F1F1F1S1) 
Reaction 2: K = (F1F10)/(F1F1S1) 
Reaction 3: K = (F1F1F10)/(F1F10) 
Reaction 4: K = (F1F1F1S1)/(F1F10) 
At 500K, the forward reaction is favored when the value of K is greater than 1. Therefore, we need to compare the magnitudes of the equilibrium constants for each reaction. 
Comparing the reactions, we can see that reaction 3 has the largest value of K, followed by reactions 4, 1 and 2. Therefore, the order of increasing tendency to proceed to completion is: 3 < 4 < 1 < 2, which matches option C.

The Following Reactions Occur at 500 K →\rarr→ Greatest Completion)

The Following Reactions Occur at 500 K $\rarr$ Greatest Completion)