---
title: "A student evaluates the thermal decomposition of sodium hydrogen carbonate in a gas-generating cartridge. The reaction at \\(298\\text{ K}\\) is represented by the following equation.  \\[2\\text{NaHCO}_3\\text{(s)} \\rightarrow \\text{Na}_2\\text{CO}_3\\text{(s)}+\\text{CO}_2\\text{(g)}+\\text{H}_2\\text{O(g)}\\]  | Substance | \\(S^\\circ\\) \\((\\text{J mol}^{-1}\\text{K}^{-1})\\) | |—|—:| | \\(\\text{NaHCO}_3\\text{(s)}\\) | 102.1 | | \\(\\text{Na}_2\\text{CO}_3\\text{(s)}\\) | 135.0 | | \\(\\text{CO}_2\\text{(g)}\\) | 213.8 | | \\(\\text{H}_2\\text{O(g)}\\) | 188.8 |  What is the value of \\(\\Delta S^\\circ\\) for the reaction as written?"
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/119367/"
date_modified: "2026-08-19T12:40:00+00:00"
---

# A student evaluates the thermal decomposition of sodium hydrogen carbonate in a gas-generating cartridge. The reaction at \(298\text{ K}\) is represented by the following equation.

\[2\text{NaHCO}_3\text{(s)} \rightarrow \text{Na}_2\text{CO}_3\text{(s)}+\text{CO}_2\text{(g)}+\text{H}_2\text{O(g)}\]

| Substance | \(S^\circ\) \((\text{J mol}^{-1}\text{K}^{-1})\) |
|—|—:|
| \(\text{NaHCO}_3\text{(s)}\) | 102.1 |
| \(\text{Na}_2\text{CO}_3\text{(s)}\) | 135.0 |
| \(\text{CO}_2\text{(g)}\) | 213.8 |
| \(\text{H}_2\text{O(g)}\) | 188.8 |

What is the value of \(\Delta S^\circ\) for the reaction as written?

A student evaluates the thermal decomposition of sodium hydrogen carbonate in a gas-generating cartridge. The reaction at \(298\text{ K}\) is represented by the following equation.

\[2\text{NaHCO}_3\text{(s)} \rightarrow \text{Na}_2\text{CO}_3\text{(s)}+\text{CO}_2\text{(g)}+\text{H}_2\text{O(g)}\]

| Substance | \(S^\circ\) \((\text{J mol}^{-1}\text{K}^{-1})\) |
|---|---:|
| \(\text{NaHCO}_3\text{(s)}\) | 102.1 |
| \(\text{Na}_2\text{CO}_3\text{(s)}\) | 135.0 |
| \(\text{CO}_2\text{(g)}\) | 213.8 |
| \(\text{H}_2\text{O(g)}\) | 188.8 |

What is the value of \(\Delta S^\circ\) for the reaction as written?

- **A.** \(-333.4\text{ J mol}^{-1}\text{K}^{-1}\)
- **B.** \(166.7\text{ J mol}^{-1}\text{K}^{-1}\)
- **C.** \(198.4\text{ J mol}^{-1}\text{K}^{-1}\)
- **D.** \(333.4\text{ J mol}^{-1}\text{K}^{-1}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119367/*