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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

1,2-Dichloroethylene can be synthesized by adding Cl2 to the carbon-carbon triple bond of acetylene.

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Using bond dissociation enthalpies, estimate the enthalpy change for this reaction in the gas phase.

Interpretation Introduction

Interpretation: The enthalpy change for the given reaction should be determined using the bond dissociation enthalpies.

Concept Introduction:

Bond dissociation enthalpy:

Bond energy or more correctly the bond dissociation enthalpy is the enthalpy change when breaking a bond in a molecule with the reactant and products in the gas phase.

The process of breaking bonds in a molecule is always endothermic, so ΔrH for bond breaking is always positive.

Explanation

1,2-Dichloroethylene can be synthesized by adding Cl2 to the carbon – carbon triple bond of acetylene.

HCCH+Cl2CCl2H21mol(835kJ/mol)+1mol(242kJ/mol)1mol(610kJ/mol)+2mol(339kJ/mol<

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