---
title: "A gaseous system containing \\(\\text{N}_2\\text{O}_4\\text{(g)}\\) and \\(\\text{NO}_2\\text{(g)}\\) at \\(350 \\text{ K}\\) is represented in the diagram below. The reversible reaction is represented by the following equation:  \\[ \\text{N}_2\\text{O}_4\\text{(g)} \\rightleftharpoons 2\\,\\text{NO}_2\\text{(g)} \\quad K_c = 2.0 \\text{ at } 350 \\text{ K} \\]  The reaction vessel has a rigid volume of \\(1.0 \\text{ L}\\), and each particle in the diagram represents \\(1.0 \\text{ mol}\\) of the designated gas. Which of the following correctly compares the forward and reverse reaction rates at the instant shown and provides the valid justification?"
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url: "https://nerd-notes.com/ubq/120303/"
date_modified: "2026-08-23T04:04:27+00:00"
---

# A gaseous system containing \(\text{N}_2\text{O}_4\text{(g)}\) and \(\text{NO}_2\text{(g)}\) at \(350 \text{ K}\) is represented in the diagram below. The reversible reaction is represented by the following equation:

\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\,\text{NO}_2\text{(g)} \quad K_c = 2.0 \text{ at } 350 \text{ K} \]

The reaction vessel has a rigid volume of \(1.0 \text{ L}\), and each particle in the diagram represents \(1.0 \text{ mol}\) of the designated gas. Which of the following correctly compares the forward and reverse reaction rates at the instant shown and provides the valid justification?

A gaseous system containing \(\text{N}_2\text{O}_4\text{(g)}\) and \(\text{NO}_2\text{(g)}\) at \(350 \text{ K}\) is represented in the diagram below. The reversible reaction is represented by the following equation:

\[ \text{N}_2\text{O}_4\text{(g)} \rightleftharpoons 2\,\text{NO}_2\text{(g)} \quad K_c = 2.0 \text{ at } 350 \text{ K} \]

The reaction vessel has a rigid volume of \(1.0 \text{ L}\), and each particle in the diagram represents \(1.0 \text{ mol}\) of the designated gas. Which of the following correctly compares the forward and reverse reaction rates at the instant shown and provides the valid justification?

![A square outline represents a 1.0 L reaction vessel. A legend at the top right indicates: one open white circle bonded to two smaller solid black circles represents NO2; two bonded open white circles, each bonded to two smaller solid black circles, represents N2O4. The vessel contains exactly 2 N2O4 molecules and exactly 4 NO2 molecules dispersed evenly throughout the interior space. One N2O4 molecule is situated in the upper-left region and the other is situated in the lower-right region. The four NO2 molecules are positioned in the upper-right, center-left, center-right, and lower-left regions. No other particles, labels, text, or annotations appear.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1787457866-bnyGgN.jpg)

- **A.** The forward and reverse reaction rates are equal because \(Q = 2.0\), which is equal to \(K_c\).
- **B.** The rate of the forward reaction is greater than the rate of the reverse reaction because \(Q = 0.50\), which is less than \(K_c\).
- **C.** The rate of the forward reaction is greater than the rate of the reverse reaction because \(Q = 8.0\), which is greater than \(K_c\).
- **D.** The rate of the reverse reaction is greater than the rate of the forward reaction because \(Q = 8.0\), which is greater than \(K_c\).

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/120303/*