Hess's Law: Calculating (enthalpy) ΔHrxn using ΔHf

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Last updated 11:05 PM on 4/10/26
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4 Terms

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<p>Hess’s Law Formula (see image)</p>

Hess’s Law Formula (see image)

ΔH = ΣvΔHf (product) - ΣvΔHf (reactants)

<p>ΔH = <span>Σv</span>ΔHf (product) - ΣvΔHf (reactants)</p>
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Σ (sigma) =

sum of (summation)

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v =

stoichiometry ratios from balanced reactions (mol ratios, the coefficients)

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ΔHf =

(kJ/mol) The standard enthalpy of formation, the amount of heat energy released or absorbed when exactly one mole of a compound is created from its pure, natural elements.