---
title: "In an atmospheric chemistry chamber, the following endothermic reaction reaches equilibrium in a sealed, rigid container at a constant initial temperature.  \\(\\text{N}_2\\text{O}_4\\text{(g)} \\rightleftharpoons 2\\text{NO}_2\\text{(g)}\\qquad \\Delta H^\\circ=+57\\text{ kJ/mol}\\)  The chamber is heated and then maintained at the higher temperature until equilibrium is reestablished. Which of the following correctly predicts what happens to the equilibrium amount of \\(\\text{NO}_2\\text{(g)}\\)?"
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url: "https://nerd-notes.com/ubq/119431/"
date_modified: "2026-08-19T12:40:18+00:00"
---

# In an atmospheric chemistry chamber, the following endothermic reaction reaches equilibrium in a sealed, rigid container at a constant initial temperature.

\(\text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\text{NO}_2\text{(g)}\qquad \Delta H^\circ=+57\text{ kJ/mol}\)

The chamber is heated and then maintained at the higher temperature until equilibrium is reestablished. Which of the following correctly predicts what happens to the equilibrium amount of \(\text{NO}_2\text{(g)}\)?

In an atmospheric chemistry chamber, the following endothermic reaction reaches equilibrium in a sealed, rigid container at a constant initial temperature.

\(\text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\text{NO}_2\text{(g)}\qquad \Delta H^\circ=+57\text{ kJ/mol}\)

The chamber is heated and then maintained at the higher temperature until equilibrium is reestablished. Which of the following correctly predicts what happens to the equilibrium amount of \(\text{NO}_2\text{(g)}\)?

- **A.** It decreases because adding heat favors the exothermic reverse reaction.
- **B.** It decreases because the equilibrium constant decreases when the temperature of any gas-phase equilibrium increases.
- **C.** It remains unchanged because heating changes reaction rates but does not change the equilibrium position.
- **D.** It increases because adding heat favors the endothermic forward reaction.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119431/*