The reaction is endothermic. Every reaction gives a H . A reaction always gives the difference between 2 or more enthalpies, neither of which is known. For many reactions we can measure H directly. When reactants are converted to products, the change in the enthalpy is the same whether the reaction takes place in one step or in a series of steps.
H is a state function.
In thermodynamics, capital letters like H indicate state functions. The value does not depend on the history of the sample, i.e. it is independent of the path. It depends on its present condition. Thermochemical data can be treated algebraically. This value is difficult to obtain experimentally.