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Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?Hº for the reaction written below, using the bond energies given. N2(g) + 3H2(g) -› 2NH3(g) N=N (nitrogen-nitrogen triple bond) (945 kJ/mol) H-H (432 kJ/mol) N-H (391 kJ/mol) Answer a. 595 kJ b. -969 kJ c. -204 kJ d. -105 kJ e. 204 kJ

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