Energy is released when hydrogen and oxygen react to produce water. This energy comes from the fact that the final hydrogen–oxygen bonds represent a lower total energy state than the original hydrogen–hydrogen and oxygen–oxygen bonds. Calculate how much energy (in kilojoules per mole of product) is released by the reaction: H2 + 1/2O2 ⇌ H2O at constant pressure and given the following standard bond enthalpies. (Standard bond enthalpies denote the enthalpy absorbed when bonds are broken at standard temperature and
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.
Energy is released when hydrogen and oxygen react to produce water. This energy comes
from the fact that the final hydrogen–oxygen bonds represent a lower total energy state
than the original hydrogen–hydrogen and oxygen–oxygen bonds. Calculate how much
energy (in kilojoules per mole of product) is released by the reaction:
H2 + 1/2O2 ⇌ H2O
at constant pressure and given the following standard bond enthalpies. (Standard bond
enthalpies denote the enthalpy absorbed when bonds are broken at standard temperature and
pressure (298 K and 1 atm)).
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