Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryThermodynamics2 Marks
Question
Explain with the help of example, the difference between bond dissociation energy and bond energy.
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Answer
Bond dissociation energy is energy required to break 1 mole of bonds, e.g. $\text{H}-\text{H(g)}\overrightarrow{\ \ \ \ \ \ }\ 2\text{H(g)};$$\Delta\text{H}=436\text{kJ mol}^{-1}$ Bond energy is energy released when 1 mole of bonds are formed, e.g. $2\text{H}\overrightarrow{\ \ \ \ \ \ }\ \text{H}_2(\text{g});$$\Delta\text{H}=-436\text{kJ mol}^{-1}$ In diatomic molecule, both bond dissociation energy and bond energy are equal in magnitude but opposite in sign.
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