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Bond energies of F_(2) and Cl_(2) are respectively 36.6 and 58.0 kcal per mole. If the heat liberated in the reaction F_(2)+Cl_(2) to 2FCl is 26.6 kcal , calculate the bond energy of F-Cl bond. |
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Answer» SOLUTION :Given that, `F_(2)+Cl_(2) to 2FCl`, `DeltaH=-26.6` kcal For reactants Bond energy of 1 mole of `F-F` bonds `=36.6 ` kcal Bond energy of 1 mole of Cl-Cl bonds `=58.0` kcal For PRODUCT Energy of formation of 2 moles of F-Cl bond `=2XX x` (where x is the bond formation energy of F-Cl bonds in kcal/mole) Adding all the HEAT changes , we get `DeltaH` of the given reaction i.e., `36.6+58+2xx x=-26.6` `x=-60.6`kcal Thus, the bond energy of `F-Cl` bonds is `+60.6` kcal per mole. |
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