Using bond-energy data, what is H deg. for the followingreaction? CH4(g) + 2Cl2(g) = CCl2(g) + 2H2(g) Bond: BondEnergy: (kJ/Mol) C-H 411 H-H 432 Cl-Cl 240 C-Cl 327 Using bond-energy data, what is H deg. for the followingreaction? CH4(g) + 2Cl2(g) = CCl2(g) + 2H2(g) Bond: BondEnergy: (kJ/Mol) C-H 411 H-H 432 Cl-Cl 240 C-Cl 327
Explanation / Answer
H0rxn = bond energy of reactants -bond energy of products ={4(C-H bond energy)+2(Cl-Clbond energy)}-{2(C-Cl bond energy)+2(H-H bond energy)} = {4(411)+2(240)}kJ/mol -{2(327)+2(432)}kJ/mol =606kJ/mol