Statement A: Hess’ law states that when reactants are converted to products, the change in enthalpy is double the value whether the reaction takes place in one step or in a series of steps. Statement B: Hess’ law states that if an overall reaction takes place in several steps, its standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions, at the same temperature. Which of the following statements is TRUE about A and B? Group of answer choices Statement A is correct, Statement B is incorrect. Both statements are incorrect Both statements are correct
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.
49. Statement A: Hess’ law states that when reactants are converted to products, the change in enthalpy is double the value whether the reaction takes place in one step or in a series of steps.
Statement B: Hess’ law states that if an overall reaction takes place in several steps, its standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions, at the same temperature.
Which of the following statements is TRUE about A and B?
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