Hess’s Law and Hess Cycles
15:39
Hess’s Law and Hess Cycles
Oct 15, 2015
revisionscience.com
General Chemistry: HESS' LAW Hess' law ,named after Germain Hess, is a relationship in physical chemistry which pertains to the sum of all enthalpy changes of chemical reactions. This is an extension for thermodynamics and chemical balancing. A B --> C A B is reactant then C is the product Rule 1: Addition of change of heat/enthalpy let ▲= delta KJ = kilo joule A B --> C ▲H = 10 KJ C D --> E ▲H = 20 KJ ---------------------------------- A B D --> E ▲H = 30 KJ Cancel out the same values if they'r
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