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www.saplinglesming.co x C Search Textbook Solut ing.com/ibiscms/mod/ibis/view.php?id-3732040 4Ju Question 21 of 21 Map do General Chemisty nUniversity Science Books presented by Sapling Leaming Use the molar bond enthalpy data in the table to estimate the value of for the equation Average molar bond enthalpies. (Hbon Bond kJ mol Bond J mol-1 The bonding in the molecules is shown here N 890 N-H390 C-o 351 N-N 159 0-O 502 N-N 418 NEN 945 F-F-1155 CI-CI243 0-0142 C-C |347 155 Number C-C615 kJ. mol C-H 414 H-H 435 H-F 565 CF 439 C-C 331HC 431 C-Br 276HBr 368 EN 1293 H-S 364 S-s 225 364 | C-N 615 O Previous Give Up & View Solution ) Check Answer @ Next Exit- about us careers privacy policy terms of use contact us

Explanation / Answer

The reaction is as follows:

CCl4 +2F2= CF4 ++ 2Cl2

In these reaction four C-Cl and 2 F-F bonds breaks and 4 C-F and 2 Cl-Cl bonds formed.

To calculate the molar enthalpy we use following expression:

Ho(reaction) = sum of the bond energies of bonds being broken - sum of the bond energies of the bonds being formed.

H°rxn= (4xC-Cl bond + 2xF-F bond) - (4xC-F bond + 2xCl-Cl bond)

H°rxn= (4x331 + 2x155) - (4x439 + 2x243) = -608kJ/mol-1

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