---
title: "A student investigates the reversible decomposition of phosgene gas, \\(\\text{COCl}_2\\text{(g)}\\), in a sealed, rigid \\(1.0 \\text{ L}\\) flask according to the following equation: \\(\\text{COCl}_2\\text{(g)} \\rightleftharpoons \\text{CO(g)} + \\text{Cl}_2\\text{(g)}\\) with \\(\\Delta H^\\circ = +108 \\text{ kJ/mol}_{rxn}\\). The system is allowed to reach equilibrium at \\(500 \\text{ K}\\). Which modification to the experimental procedure will increase the equilibrium yield of \\(\\text{Cl}_2\\text{(g)}\\)?"
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url: "https://nerd-notes.com/ubq/119258/"
date_modified: "2026-08-19T12:39:33+00:00"
---

# A student investigates the reversible decomposition of phosgene gas, \(\text{COCl}_2\text{(g)}\), in a sealed, rigid \(1.0 \text{ L}\) flask according to the following equation: \(\text{COCl}_2\text{(g)} \rightleftharpoons \text{CO(g)} + \text{Cl}_2\text{(g)}\) with \(\Delta H^\circ = +108 \text{ kJ/mol}_{rxn}\). The system is allowed to reach equilibrium at \(500 \text{ K}\). Which modification to the experimental procedure will increase the equilibrium yield of \(\text{Cl}_2\text{(g)}\)?

A student investigates the reversible decomposition of phosgene gas, \(\text{COCl}_2\text{(g)}\), in a sealed, rigid \(1.0 \text{ L}\) flask according to the following equation: \(\text{COCl}_2\text{(g)} \rightleftharpoons \text{CO(g)} + \text{Cl}_2\text{(g)}\) with \(\Delta H^\circ = +108 \text{ kJ/mol}_{rxn}\). The system is allowed to reach equilibrium at \(500 \text{ K}\). Which modification to the experimental procedure will increase the equilibrium yield of \(\text{Cl}_2\text{(g)}\)?

- **A.** Adding a solid catalyst to the flask at \(500 \text{ K}\)
- **B.** Decreasing the volume of the reaction container from \(1.0 \text{ L}\) to \(0.5 \text{ L}\) at \(500 \text{ K}\)
- **C.** Increasing the temperature of the reaction vessel from \(500 \text{ K}\) to \(600 \text{ K}\)
- **D.** Injecting \(0.10 \text{ mol}\) of \(\text{Ar(g)}\) into the rigid flask at \(500 \text{ K}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119258/*