The statement, that describes Hess's law applied in calculating enthalpy is "all the reactions in a path are added together."
What is Hess' law?
Hess' law of continuous heat summation, abbreviated as Hess' law. Hess' law says that the rise in enthalpy, or reaction heat at constant pressure, in a chemical reaction is independent of the process between the starting and final states.
According to Hess's Law, the enthalpy change for a chemical reaction is independent of the route travelled. This indicates that the overall enthalpy change will be the same regardless of how many steps are completed. Because enthalpy is a state function, we can calculate the overall change in enthalpy by simply adding the changes at each step along the way until the product is obtained All processes must take place at the same temperature, and the equations for each step must balance.
In a Hess's Law problem, you must devise a technique for adding the numerous equations in the correct order.
Hence the correct answer is B.
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