3.1.4.3 - Hess's law
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Hess’s Law
Total enthalpy change of reaction is independent of the route taken
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Hess’s Law example
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Calculating enthalpy change using enthalpy of formation
Need to know ΔfH⦵ of all reactants + products that are compounds
4
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Hess’s Law equation
ΔrH⦵ = sum of ΔfH⦵ products - sum of ΔfH⦵ reactants
5
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Calculating enthalpy change using enthalpy of combustion
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Hess’s Law diagram with backwards arrow example
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