Problem

Problem

An engineer must select operating conditions for a new Haber–Bosch unit. Safety regulations prohibit pressures above 250 atm250\,\text{atm}, and energy costs rise sharply above 500∘C500^{\circ}\text{C}. Four proposals are given below. All reactors use an iron catalyst and continuously recycle unreacted feed gases. A. 480∘C,  240 atm480^{\circ}\text{C},\;240\,\text{atm}, no continuous removal of NH3\text{NH}_{3} B. 480∘C,  160 atm480^{\circ}\text{C},\;160\,\text{atm}, continuous removal of NH3\text{NH}_{3} C. 420∘C,  240 atm420^{\circ}\text{C},\;240\,\text{atm}, continuous removal of NH3\text{NH}_{3} D. 420∘C,  160 atm420^{\circ}\text{C},\;160\,\text{atm}, continuous removal of NH3\text{NH}_{3} Which proposal is expected to give the greatest equilibrium mole fraction of ammonia while meeting the stated constraints? a) Proposal A b) Proposal D c) Proposal C d) Proposal B

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