How much energy, in kilojoules, is released or absorbed from the reaction of one mole of nitrogen, N2, with three moles of molecular hydrogen, H2, to form two moles of ammonia, NH3? H-N (bond energy: 389 kJ/mol)H-H (bond energy: 436 kJ/mol)N 
N (bond energy: 946 kJ/mol) N N + H-H + H-H ? NH3 + NH3
A. ?80 kJ/mol released
B. +80 kJ/mol absorbed
C. +899 kJ/mol absorbed
D. ?993 kJ/mol released
Answer: A
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