Hess' law is used to determine reaction enthalpy change indirectly (using an alternative route of reaction)

Hess' law can be calculated using bond enthalpies or expermental data to determine ΔH1 and ΔH2

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Use the provided image to determine the equation used to calculate ΔH according to Hess' Law.

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What is the equation for Hess' Law when using enthalpies of formation?

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What is the first step to using Hess' Law?

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What is the enthalpy of formation of methane? You may use the Hess cycle provided to help you. ΔHc(CH₄) = −892 kJ/mol, ΔHc(H₂) = −286 kJ/mol and ΔHc(C) = −394 kJ/mol.

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What is the standard enthalpy of reaction for NaOH + HCl → H₂O + NaCl? ΔHf(NaOH) = −469 kJ/mol, ΔHf(HCl) = −92.3 kJ/mol, ΔHf(H₂O) = −286 kJ/mol and ΔHf(NaCl) = −407 kJ/mol.

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