Standard Enthalpy from Formation (ΔH°rxn = Σ ΔHf°(products) − Σ ΔHf°(reactants))

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ΔH°rxn = Σ ΔHf°(products) − Σ ΔHf°(reactants)

What each symbol means

SymbolWhat it stands for
νStoichiometric coefficient

When to use this

Standard states, 298 K usually; elements in reference form have ΔHf° = 0.