---
title: "A sample of pure \\(\\text{N}_2\\text{O}_4\\text{(g)}\\) is placed into a rigid, evacuated container maintained at a constant temperature of \\(298\\text{ K}\\), where the reversible reaction represented below occurs.  \\[ \\text{N}_2\\text{O}_4\\text{(g)} \\rightleftharpoons 2\\,\\text{NO}_2\\text{(g)} \\]  After a period of time, the total pressure and the partial pressures of both gases inside the container become constant. Which of the following statements best describes the state of the system and provides the correct justification?"
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url: "https://nerd-notes.com/ubq/120270/"
date_modified: "2026-08-23T04:04:09+00:00"
---

# A sample of pure \(\text{N}_2\text{O}_4\text{(g)}\) is placed into a rigid, evacuated container maintained at a constant temperature of \(298\text{ K}\), where the reversible reaction represented below occurs.

\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\,\text{NO}_2\text{(g)} \]

After a period of time, the total pressure and the partial pressures of both gases inside the container become constant. Which of the following statements best describes the state of the system and provides the correct justification?

A sample of pure \(\text{N}_2\text{O}_4\text{(g)}\) is placed into a rigid, evacuated container maintained at a constant temperature of \(298\text{ K}\), where the reversible reaction represented below occurs.

\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\,\text{NO}_2\text{(g)} \]

After a period of time, the total pressure and the partial pressures of both gases inside the container become constant. Which of the following statements best describes the state of the system and provides the correct justification?

- **A.** The chemical reaction continues to occur, because the rate of the forward reaction is equal to the rate of the reverse reaction.
- **B.** The chemical reaction continues to occur, because the concentration of \(\text{NO}_2\text{(g)}\) has become equal to the concentration of \(\text{N}_2\text{O}_4\text{(g)}\).
- **C.** The chemical reaction has stopped occurring, because the rates of both the forward and reverse reactions have decreased to zero.
- **D.** The chemical reaction has stopped occurring, because all of the \(\text{N}_2\text{O}_4\text{(g)}\) reactant molecules have been completely consumed.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120270/*