---
title: "At a particular temperature, the reaction  \\(2\\text{SO}_2\\text{(g)}+\\text{O}_2\\text{(g)}\\rightleftharpoons2\\text{SO}_3\\text{(g)}\\)  is at equilibrium in a sealed, rigid vessel. A small amount of solid \\(\\text{V}_2\\text{O}_5\\), which acts as a catalyst and has negligible volume, is added while the temperature remains constant. Which choice correctly predicts both the forward and reverse reaction rates immediately after the catalyst is added and the partial pressure of \\(\\text{SO}_3\\text{(g)}\\) after sufficient time?"
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url: "https://nerd-notes.com/ubq/119436/"
date_modified: "2026-08-19T12:40:21+00:00"
---

# At a particular temperature, the reaction

\(2\text{SO}_2\text{(g)}+\text{O}_2\text{(g)}\rightleftharpoons2\text{SO}_3\text{(g)}\)

is at equilibrium in a sealed, rigid vessel. A small amount of solid \(\text{V}_2\text{O}_5\), which acts as a catalyst and has negligible volume, is added while the temperature remains constant. Which choice correctly predicts both the forward and reverse reaction rates immediately after the catalyst is added and the partial pressure of \(\text{SO}_3\text{(g)}\) after sufficient time?

At a particular temperature, the reaction

\(2\text{SO}_2\text{(g)}+\text{O}_2\text{(g)}\rightleftharpoons2\text{SO}_3\text{(g)}\)

is at equilibrium in a sealed, rigid vessel. A small amount of solid \(\text{V}_2\text{O}_5\), which acts as a catalyst and has negligible volume, is added while the temperature remains constant. Which choice correctly predicts both the forward and reverse reaction rates immediately after the catalyst is added and the partial pressure of \(\text{SO}_3\text{(g)}\) after sufficient time?

- **A.** Forward and reverse rates: both decrease and remain equal; final \(P_{\text{SO}_3}\): increases
- **B.** Forward and reverse rates: both decrease and remain equal; final \(P_{\text{SO}_3}\): unchanged
- **C.** Forward and reverse rates: both increase and remain equal; final \(P_{\text{SO}_3}\): increases
- **D.** Forward and reverse rates: both increase and remain equal; final \(P_{\text{SO}_3}\): unchanged

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119436/*