The Haber process

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What is the equation for the Haber process?

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What are the conditions used in the Haber process and why do we use them?

Temperature

  • 450°C

  • Compromise between yield and rate of reaction

  • Forward reaction is exo so too high gives us a lower yield of ammonia but too low means slower rate of reaction

  • High temp= lower equilibrium yield but faster rate of reaction

Pressure

  • 200 atm

  • Higher pressure gives higher yield of ammonia

  • Too high of pressure means it’s very expensive so compromise is used

Catalyst

  • Phosphoric acid

  • Only increases the rate of reaction

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