---
title: "A reversible gas-phase reaction is represented by the balanced equation below.  \\[ \\text{A(g)} \\rightleftharpoons \\text{B(g)} \\]  Container 1 represents an equilibrium mixture of \\(\\text{A(g)}\\) and \\(\\text{B(g)}\\) in a \\(1.0\\text{ L}\\) rigid vessel at temperature \\(T\\). Container 2 represents a newly prepared mixture of \\(\\text{A(g)}\\) and \\(\\text{B(g)}\\) in an identical \\(1.0\\text{ L}\\) rigid vessel at the same temperature \\(T\\).  Which of the following correctly predicts how the system in Container 2 will reach equilibrium at temperature \\(T\\)?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/120298/"
date_modified: "2026-08-23T04:04:22+00:00"
---

# A reversible gas-phase reaction is represented by the balanced equation below.

\[ \text{A(g)} \rightleftharpoons \text{B(g)} \]

Container 1 represents an equilibrium mixture of \(\text{A(g)}\) and \(\text{B(g)}\) in a \(1.0\text{ L}\) rigid vessel at temperature \(T\). Container 2 represents a newly prepared mixture of \(\text{A(g)}\) and \(\text{B(g)}\) in an identical \(1.0\text{ L}\) rigid vessel at the same temperature \(T\).

Which of the following correctly predicts how the system in Container 2 will reach equilibrium at temperature \(T\)?

A reversible gas-phase reaction is represented by the balanced equation below.

\[ \text{A(g)} \rightleftharpoons \text{B(g)} \]

Container 1 represents an equilibrium mixture of \(\text{A(g)}\) and \(\text{B(g)}\) in a \(1.0\text{ L}\) rigid vessel at temperature \(T\). Container 2 represents a newly prepared mixture of \(\text{A(g)}\) and \(\text{B(g)}\) in an identical \(1.0\text{ L}\) rigid vessel at the same temperature \(T\).

Which of the following correctly predicts how the system in Container 2 will reach equilibrium at temperature \(T\)?

![A single grayscale diagram shows two identical square containers side-by-side. A legend centered above the containers maps: open circle = particle of \(\text{A(g)}\); filled black circle = particle of \(\text{B(g)}\). The left container is labeled 'Container 1 (Equilibrium)' and contains exactly 2 open circles and exactly 6 filled black circles dispersed randomly throughout the interior space. The right container is labeled 'Container 2 (Initial)' and contains exactly 6 open circles and exactly 2 filled black circles dispersed randomly throughout the interior space. Both containers represent rigid \(1.0\text{ L}\) vessels at the same temperature \(T\). No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787457862-yigody.jpg)

- **A.** More \(\text{A(g)}\) will form because \(Q > K_c\), indicating the reverse reaction occurs faster than the forward reaction.
- **B.** More \(\text{A(g)}\) will form because \(Q < K_c\), indicating the reverse reaction occurs faster than the forward reaction.
- **C.** More \(\text{B(g)}\) will form because \(Q < K_c\), indicating the forward reaction occurs faster than the reverse reaction.
- **D.** More \(\text{B(g)}\) will form because \(Q > K_c\), indicating the forward reaction occurs faster than the reverse reaction.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120298/*