If for the reaction CCl ₄( ~g ) C ( g )+4 Cl ( g ) the following data is given aligned & _ vap H ^ CCl ₄( l )=30 ~kJ ~mol ⁻¹ , vap = vaporization & _ f H ^ _ CCl ₄ =-136.0 ~kJ ~mol ⁻¹, f = formation & _ a H _ C ^ q =714.0 ~kJ ~mol ⁻¹, a = a

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If for the reaction CCl ₄( ~g ) C ( g )+4 Cl ( g ) the following data is given aligned & _ vap H ^ CCl ₄( l )=30 ~kJ ~mol ⁻¹ , vap = vaporization & _ f H ^ _ CCl ₄ =-136.0 ~kJ ~mol ⁻¹, f = formation & _ a H _ C ^ q =714.0 ~kJ ~mol ⁻¹, a = atomization & _ a H ^ Cl ₂=242.0 ~kJ ~mol ⁻¹, a = atomization aligned the bond mean enthalpy of C - Cl in CCl ₄( l ) is

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Correct answer: B. 326

CCl ₄( ~g ) C ( g )+4 Cl ( g ) or aligned & CCl ₄( ~g ) C ( g )+2 Cl ₂( ~g ) & H _ r ^ = _ a H ^ ( c )+2 _ a H ^ ( Cl ₂ ) & - _ vap H ^ - _ f H ^ ( CCl ₄ ) & =(714)+[2 242.0]-(30.0)-(-136.0) & =1304 ~kJ ~mol ⁻¹ & Average bond enthalpy of C - Cl bond & = 1304 4 =326 ~kJ ~mol ⁻¹ aligned

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