Question

Why is it important to give the states of the reactants and products when giving an equation for ΔH?

Answer 1

ΔH refers to change in enthalpy or total heat content of a system. Mathematically enthalpy can be expressed as:

Total heat content of a system (H) = [internal energy of the system + (pressure x volume) ]

                                                        H =  E + PV

This state function H depends on mass of the reactants and the physical states of both the reactants and products. Since, ΔH depends on the physical states of the reactants and products, they must be stated.

Answer 2

∆H means CHANGE IN ENTHALPY...☺☺✌☺☺