Chapter 4, Problem 83E

(a)

Interpretation Introduction

To determine: The box that represents a system at equilibrium if $K_{\text{c}}=1$ .

Solution: The given box 1 represents the system at equilibrium.

Explanation:

Given

The balanced chemical reaction is,

${\text{A}}_2\left(g\right)+{\text{B}}_2\left(g\right)\to 2\text{AB}\left(g\right)$

The system at equilibrium means the rate of the forward reaction is equal to the rate of the backward reaction. The system which contains the equal number of atoms of $\text{A}$ , $\text{B}$ and $\text{AB}$ will be considered at equilibrium.
Since, the box 1 contains equal number of atoms of $\text{A}$ , $\text{B}$ and $\text{AB}$ . Therefore, this box represents the system is at equilibrium.

Conclusion:

The box 1 represents the system at equilibrium.

(b)

Interpretation Introduction

To determine: The box that represents the system at $Q<K_{\text{c}}$ if $K_{\text{c}}=1$ .

(c)

Interpretation Introduction

To determine: The correct increasing magnitude of $\Delta G$ order of the boxes for the given reaction.