The true statement of the enthalpy of a reaction is its value does not depend on which reaction is added. The correct option is C.
What is enthalpy?
Enthalpy is a term of thermodynamics. It is the total internal energy and product of the pressure and volume of a system. It can not be calculated, but can be changed.
Thus, the correct option is C, its value does not depend on which reaction is added.
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