Final answer:
Enthalpy values apply to all three states of matter: solid, liquid, and gas. They provide valuable information about the energy changes that occur in different states of matter.
Step-by-step explanation:
The state of matter that enthalpy values apply to is...
Enthalpy values apply to all three states of matter: solid, liquid, and gas. Enthalpy is a measure of the heat or energy content of a substance, and it can be used to describe the changes in energy that occur during physical or chemical processes. For example, when a substance changes from a solid to a liquid (melting) or from a liquid to a gas (evaporation), there is a change in enthalpy, which can be calculated using the formula ΔH = q/m, where ΔH is the change in enthalpy, q is the heat exchanged, and m is the mass of the substance.
Enthalpy values are used in various applications, such as determining the heat of reaction in chemical reactions and predicting the feasibility of physical processes. They provide valuable information about the energy changes that occur in different states of matter.