Using Hess Law
- Created by: Jasmin
- Created on: 22-01-14 08:47
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- Using Hess's Law
- Hess's law states that:
- The total enthalpy change for a reaction is independent of the route taken, provided the initial and final conditions are the same
- To be able to draw Hess's law the requirements are that:
- There are 2 routes between teh reactants and products to be able to draw a Hess cycle
- The data for the enthalpy changes for one route is given
- Calculating standard enthalpy changes of formation from standard enthalpy changes of combustion
- Enthalpy change of formation of a hydrocarbon fuel can be found using enthalpy change of combustion
- You draw Hess cycle linking the formation of the fuel with the combustion of its constituent elements
- Example
- You draw Hess cycle linking the formation of the fuel with the combustion of its constituent elements
- Enthalpy change of formation of a hydrocarbon fuel can be found using enthalpy change of combustion
- Enthalpy change of formation for any element is 0
- Hess's law states that:
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