The graph below shows G as a function of temperature for the synthesis of ammonia from nitrogen

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The graph below shows ΔG° as a function of temperature for the synthesis of ammonia from nitrogen and hydrogen.

AG (kJ) 40 30 20 10 0 -10 -20 -30 -40 1 250 300 N(g) + 3 H(g)  2 NH3(g) 350 450 400 Temperature (K) 500 550


(a) Use the graph to estimate ΔS° for the ammonia synthesis reaction.

(b) Given that the standard free energy change of formation for ammonia (ΔGf°) is –16.50 kJ/mol, estimate ΔH° for the ammonia synthesis reaction.

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Chemistry For Engineering Students

ISBN: 9780357026991

4th Edition

Authors: Lawrence S. Brown, Tom Holme

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