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AQA A-level Chemistry Hess' Law

Hess' Law

This page covers the following topics:

1. Hess's Law 1
2. Hess' Law 2

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

Hess's Law 1

Hess' law can be calculated using bond enthalpies or expermental data to determine Ξ”H1 and Ξ”H2

Hess' Law 2

1

What is the first step to using Hess' Law?

What is the first step to using Hess' Law?

2

Calculate Ξ”Hr for the reaction shown in the picture.

Calculate Ξ”Hr for the reaction shown in the picture.

3

Calculate Ξ”Hr for the reaction shown in the diagram.

Calculate Ξ”Hr for the reaction shown in the diagram.

4

Using the Hess cycle given, what is the standard enthalpy of reaction for CaCO₃ β†’ COβ‚‚ + CaO?

Using the Hess cycle given, what is the standard enthalpy of reaction for CaCO₃ β†’ COβ‚‚ + CaO?

5

What is Hess' Law?

What is Hess' Law?

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