HESS’ LAW:

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Hess’ Law is an idea that you can add or summarize multiple chemical equations together to learn about the overall enthalpy or energy information about them. However, this addition of equations is not the usual addition that you are used to. We have to manipulate the chemical equations and their enthalpy through multiplication, division, and reversal of signs (positive and negative). This concept is very hard to understand without intense study of the examples below.