18. Solution to Chemistry Problem

18. Solution to Chemistry Problem

21. The heat effects of the following reactions are known
C2H6(g)=2CH3(g) ΔH298=376.1 kJ*mol-1
CH3Cl(g) Cl(g)=CH3(g) Cl2(g) ΔH298=106.0 kJ*mol-1
2CCH3Cl 2Na=C2H6 2NaCl ΔH298=-742.9 kJ*mol-1
Calculate the bond energy in the Cl2 molecule if the enthalpy of formation of sodium chloride is -411.1 kJ*mol-1

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