NEET levelSingle correct optionDifficulty 1 of 3td116
Hess's law of constant heat summation states that the enthalpy change of a reaction
Adepends on the number of steps in the route
Bis always equal to the internal energy change
Cis zero for any reaction carried out in several steps
Ddepends only on the initial and final states, not on the route followed
Answer: D
Enthalpy is a state function, so the total ΔH for a reaction is the same whether it occurs in one step or several, provided the initial and final states are identical.