Which of the following is a statement of Hess’s law? If a reaction is carried out in a series of steps, the Δ H for the reaction will equal the sum of the enthalpy changes for the individual steps. The Δ H for a process in the forward direction is equal to the Δ H for the process in the reverse direction. The Δ H of a reaction does not depend on the physical states of the reactants and products. If a reaction is carried out in a series of steps, the Δ H for the reaction will equal the product of the enthalpy changes for the individual steps.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Which of the following is a statement of Hess’s law?
- If a reaction is carried out in a series of steps, the Δ H for the reaction will equal the sum of the enthalpy changes for the individual steps.
- The Δ H for a process in the forward direction is equal to the Δ H for the process in the reverse direction.
- The Δ H of a reaction does not depend on the physical states of the reactants and products.
- If a reaction is carried out in a series of steps, the Δ H for the reaction will equal the product of the enthalpy changes for the individual steps.
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