Chemistry — Hess's Law Cycle

Alternative routes give the same enthalpy change.

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digraph Hess {
  node [shape=box, style=rounded];
  Reactants -> Products [label="direct, dH1"];
  Reactants -> Intermediates [label="dH2"];
  Intermediates -> Products [label="dH3"];
  "dH1 = dH2 + dH3" [shape=ellipse];
}