3.1.4.3 - Hess's law

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Chemistry

A-Level Chemistry

AQA

10th

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6 Terms

1
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Hess’s Law

Total enthalpy change of reaction is independent of the route taken

2
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Hess’s Law example

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3
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Calculating enthalpy change using enthalpy of formation

  • Need to know ΔfH⦵ of all reactants + products that are compounds

<ul><li><p>Need to know <span>Δ</span><sub>f</sub><em>H</em><sup>⦵ </sup>of all reactants + products that are <strong>compounds</strong></p></li></ul><p></p>
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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6
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Hess’s Law diagram with backwards arrow example

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