---
title: "A student investigating the thermodynamics of nitrogen oxides compiles the thermochemical data shown in the table below.  | Reaction | \\(\\Delta H^\\circ\\ (\\text{kJ/mol}_{\\text{rxn}})\\) | |—|—| | \\(2\\text{NO}(g) + \\text{O}_2(g) \\rightarrow 2\\text{NO}_2(g)\\) | \\(-114\\) | | \\(2\\text{N}_2\\text{O}(g) \\rightarrow 2\\text{N}_2(g) + \\text{O}_2(g)\\) | \\(-164\\) | | \\(\\text{N}_2(g) + \\text{O}_2(g) \\rightarrow 2\\text{NO}(g)\\) | \\(+180\\) |  Based on the data, what is the value of \\(\\Delta H^\\circ\\) for the reaction \\(\\text{N}_2\\text{O}(g) + \\text{NO}_2(g) \\rightarrow 3\\text{NO}(g)\\) ?"
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/119751/"
date_modified: "2026-08-21T08:12:13+00:00"
---

# A student investigating the thermodynamics of nitrogen oxides compiles the thermochemical data shown in the table below.

| Reaction | \(\Delta H^\circ\ (\text{kJ/mol}_{\text{rxn}})\) |
|—|—|
| \(2\text{NO}(g) + \text{O}_2(g) \rightarrow 2\text{NO}_2(g)\) | \(-114\) |
| \(2\text{N}_2\text{O}(g) \rightarrow 2\text{N}_2(g) + \text{O}_2(g)\) | \(-164\) |
| \(\text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g)\) | \(+180\) |

Based on the data, what is the value of \(\Delta H^\circ\) for the reaction \(\text{N}_2\text{O}(g) + \text{NO}_2(g) \rightarrow 3\text{NO}(g)\) ?

A student investigating the thermodynamics of nitrogen oxides compiles the thermochemical data shown in the table below.

| Reaction | \(\Delta H^\circ\ (\text{kJ/mol}_{\text{rxn}})\) |
|---|---|
| \(2\text{NO}(g) + \text{O}_2(g) \rightarrow 2\text{NO}_2(g)\) | \(-114\) |
| \(2\text{N}_2\text{O}(g) \rightarrow 2\text{N}_2(g) + \text{O}_2(g)\) | \(-164\) |
| \(\text{N}_2(g) + \text{O}_2(g) \rightarrow 2\text{NO}(g)\) | \(+180\) |

Based on the data, what is the value of \(\Delta H^\circ\) for the reaction \(\text{N}_2\text{O}(g) + \text{NO}_2(g) \rightarrow 3\text{NO}(g)\) ?

- **A.** \(-98\text{ kJ/mol}_{\text{rxn}}\)
- **B.** \(+41\text{ kJ/mol}_{\text{rxn}}\)
- **C.** \(+130\text{ kJ/mol}_{\text{rxn}}\)
- **D.** \(+155\text{ kJ/mol}_{\text{rxn}}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119751/*