SAMPLE PROBLEM 10.6
(continued)
bonds broken
bonds formed
4 C-H = 4 mol (413 kJ/mol) = 1652 kJ
3 Cl-Cl = 3 mol (243 kJ/mol) = 729 kJ
DHobonds broken = 2381 kJ
3 C-Cl = 3 mol (-339 kJ/mol) = -1017 kJ
1 C-H = 1 mol (-413 kJ/mol) = -413 kJ
DHobonds formed = -2711 kJ
3 H-Cl = 3 mol (-427 kJ/mol) = -1281 kJ
DHoreaction = DHobonds broken + DHobonds formed = 2381 kJ + (-2711 kJ) = - 330 kJ
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