---
title: "A rigid, sealed \\(1.0 \\text{ L}\\) reaction vessel contains a mixture of \\(\\text{NO(g)}\\) and \\(\\text{O}_2\\text{(g)}\\) at a constant temperature. The system reacts and reaches equilibrium according to the balanced equation below:  \\[ 2\\,\\text{NO(g)} + \\text{O}_2\\text{(g)} \\rightleftharpoons 2\\,\\text{NO}_2\\text{(g)} \\]  The initial and equilibrium concentrations of the species are recorded in the table below:  | Species | Initial Concentration (M) | Equilibrium Concentration (M) | | :— | :— | :— | | \\(\\text{NO(g)}\\) | \\(0.60\\) | \\(?\\) | | \\(\\text{O}_2\\text{(g)}\\) | \\(0.40\\) | \\(?\\) | | \\(\\text{NO}_2\\text{(g)}\\) | \\(0.00\\) | \\(0.40\\) |  Based on the data, what is the numerical value of the equilibrium constant, \\(K_c\\), for the reaction at this temperature?"
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url: "https://nerd-notes.com/ubq/123774/"
date_modified: "2026-09-28T12:30:15+00:00"
---

# A rigid, sealed \(1.0 \text{ L}\) reaction vessel contains a mixture of \(\text{NO(g)}\) and \(\text{O}_2\text{(g)}\) at a constant temperature. The system reacts and reaches equilibrium according to the balanced equation below:

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

The initial and equilibrium concentrations of the species are recorded in the table below:

| Species | Initial Concentration (M) | Equilibrium Concentration (M) |
| :— | :— | :— |
| \(\text{NO(g)}\) | \(0.60\) | \(?\) |
| \(\text{O}_2\text{(g)}\) | \(0.40\) | \(?\) |
| \(\text{NO}_2\text{(g)}\) | \(0.00\) | \(0.40\) |

Based on the data, what is the numerical value of the equilibrium constant, \(K_c\), for the reaction at this temperature?

A rigid, sealed \(1.0 \text{ L}\) reaction vessel contains a mixture of \(\text{NO(g)}\) and \(\text{O}_2\text{(g)}\) at a constant temperature. The system reacts and reaches equilibrium according to the balanced equation below:

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

The initial and equilibrium concentrations of the species are recorded in the table below:

| Species | Initial Concentration (M) | Equilibrium Concentration (M) |
| :--- | :--- | :--- |
| \(\text{NO(g)}\) | \(0.60\) | \(?\) |
| \(\text{O}_2\text{(g)}\) | \(0.40\) | \(?\) |
| \(\text{NO}_2\text{(g)}\) | \(0.00\) | \(0.40\) |

Based on the data, what is the numerical value of the equilibrium constant, \(K_c\), for the reaction at this temperature?

- **A.** \(0.050\)
- **B.** \(4.0\)
- **C.** \(20\)
- **D.** \(50\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/123774/*