PPT Slide

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• Since enthalpy is a state function, _H for complex reactions can be  defined irrespective of how the reaction actually occurs.

• Hessís law: the enthalpy change of an overall process is the sum of  the enthalpy changes of its individual steps.

• Alter eqíns 1 and 2 so that the substances sum to equation 3, then  _H 3 is the sum of the altered enthalpy changes of eqíns 1 and 2.

• Equations 1 and 3 contain the same amount of sulfur, so leave  equation 1 unchanged.

Concept 6-12. The importance of Hessís law and the manipulation of DH values

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