Air is approximately 78% nitrogen, however the strong N_2 triple bond (BE=941 kj

Question

Air is approximately 78% nitrogen, however the strong N_2 triple bond (BE=941 kj mole^-1) makes it not readily available to biological organisms. As a result nitrogen ammonia using the iron catalyzed Haber_Biscg oricess gas aksi gad a tremendous humanitarian impact; today it provides 454 million tonnes of nitrogen fertilizer peryear. Generally, the Haber_Bosch process affords ammonia by combining nitrogen from air and hydrogen derived from natural gas. Write a balanced equation for the reaction of nitrogen with hydrogen.

Explanation / Answer

a)
   N2 + 3H2- > 2NH3

b) heat of reaction = BDE reactants - BDE products
     = BDE(N2) + 3*BDE(H2) - 2*3*BDE(N-H)
    = 941 + 3*436 - 6*389
    = -85kJ/mole

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