---
title: "\\[ \\text{C}_2	ext{H}_4\\text{(g)} + \\text{Cl}_2\\text{(g)} \\rightarrow \\text{C}_2\\text{H}_4\\text{Cl}_2\\text{(g)} \\]  | Bond | Average bond enthalpy (\\(\\text{kJ/mol}\\)) | | :— | :— | | \\(\\text{C}-\\text{H}\\) | \\(410\\) | | \\(\\text{C}-\\text{C}\\) | \\(350\\) | | \\(\\text{C}=\\text{C}\\) | \\(610\\) | | \\(\\text{Cl}-\\text{Cl}\\) | \\(240\\) | | \\(\\text{C}-\\text{Cl}\\) | \\(330\\) |  A student investigates the addition reaction between ethene, \\(\\text{C}_2\\text{H}_4\\text{(g)}\\), and chlorine gas, \\(\\text{Cl}_2\\text{(g)}\\), to produce 1,2-dichloroethane, \\(\\text{C}_2\\text{H}_4\\text{Cl}_2\\text{(g)}\\), as represented by the balanced equation above. Based on the average bond enthalpies given in the table, what is the estimated enthalpy change of the reaction, \\(\\Delta H^\\circ_{\\text{rxn}}\\)?"
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url: "https://nerd-notes.com/ubq/119710/"
date_modified: "2026-08-21T08:12:07+00:00"
---

# \[ \text{C}_2	ext{H}_4\text{(g)} + \text{Cl}_2\text{(g)} \rightarrow \text{C}_2\text{H}_4\text{Cl}_2\text{(g)} \]

| Bond | Average bond enthalpy (\(\text{kJ/mol}\)) |
| :— | :— |
| \(\text{C}-\text{H}\) | \(410\) |
| \(\text{C}-\text{C}\) | \(350\) |
| \(\text{C}=\text{C}\) | \(610\) |
| \(\text{Cl}-\text{Cl}\) | \(240\) |
| \(\text{C}-\text{Cl}\) | \(330\) |

A student investigates the addition reaction between ethene, \(\text{C}_2\text{H}_4\text{(g)}\), and chlorine gas, \(\text{Cl}_2\text{(g)}\), to produce 1,2-dichloroethane, \(\text{C}_2\text{H}_4\text{Cl}_2\text{(g)}\), as represented by the balanced equation above. Based on the average bond enthalpies given in the table, what is the estimated enthalpy change of the reaction, \(\Delta H^\circ_{\text{rxn}}\)?

\[ \text{C}_2	ext{H}_4\text{(g)} + \text{Cl}_2\text{(g)} \rightarrow \text{C}_2\text{H}_4\text{Cl}_2\text{(g)} \]

| Bond | Average bond enthalpy (\(\text{kJ/mol}\)) |
| :--- | :--- |
| \(\text{C}-\text{H}\) | \(410\) |
| \(\text{C}-\text{C}\) | \(350\) |
| \(\text{C}=\text{C}\) | \(610\) |
| \(\text{Cl}-\text{Cl}\) | \(240\) |
| \(\text{C}-\text{Cl}\) | \(330\) |

A student investigates the addition reaction between ethene, \(\text{C}_2\text{H}_4\text{(g)}\), and chlorine gas, \(\text{Cl}_2\text{(g)}\), to produce 1,2-dichloroethane, \(\text{C}_2\text{H}_4\text{Cl}_2\text{(g)}\), as represented by the balanced equation above. Based on the average bond enthalpies given in the table, what is the estimated enthalpy change of the reaction, \(\Delta H^\circ_{\text{rxn}}\)?

- **A.** \(-400 \text{ kJ/mol}_{\text{rxn}}\)
- **B.** \(-160 \text{ kJ/mol}_{\text{rxn}}\)
- **C.** \(+160 \text{ kJ/mol}_{\text{rxn}}\)
- **D.** \(+190 \text{ kJ/mol}_{\text{rxn}}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/119710/*