What is Hess' law?
Hess' law states that the enthalpy change for a chemical reaction is the same, whatever route is taken from reactants to products.
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What formula is used to calculate the enthalpy change of a reaction (ΔHr) using enthalpy of formation values (ΔHf)?
∆Hr = Σ∆Hf(products) - Σ∆Hf(reactants)
Σ = sum of
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What formula is used to calculate the enthalpy change of a reaction (ΔHr) using enthalpy of combustion values (ΔHc)?
∆Hr = Σ∆Hc(reactants) - Σ∆Hc(products)
Σ = sum of
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What is the ΔH⦵f value for an element?
Zero
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