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Chemistry — The Haber Process

Industrial ammonia synthesis with its conditions.

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digraph Haber {
  rankdir=LR;
  node [shape=box, style=rounded];
  "N2 (from air)" -> Reactor;
  "H2 (from methane)" -> Reactor;
  Reactor -> "Ammonia NH3" [label="450C, 200 atm, Fe catalyst"];
  "Ammonia NH3" -> Condenser [label="cool & liquefy"];
  Condenser -> "Unreacted N2 + H2" [label="recycled"];
  "Unreacted N2 + H2" -> Reactor;
}