The heat capacities for each of the substances involved for a particular reaction are given below. The enthalpy change for the same reaction at 298 Kelvin is -282.987 KJ/mole. From these, answer the questions that follow. Temperature-Dependence of the heat capacities of the Substances for the given reaction (SEE IMAGE) (A). Write the overall equation for the heat capacity (in terms of the temperature, T) for the overall reaction. (B). What would be change in enthalpy (∆H in KiloJoules) as the reaction transitions from 298K to a different temperature, such as 1,000K (from 298K to 1000K)? (C). What would be the overall enthalpy change at 1,000 Kelvin (∆H @ 1000K, in KJ)? (D). What would be the overall change in the internal energy at 1,000 Kelvin (∆U @ 1000K, in KJ)?
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.
The heat capacities for each of the substances involved for a particular reaction are given below. The enthalpy change for the same reaction at 298 Kelvin is -282.987 KJ/mole. From these, answer the questions that follow.
Temperature-Dependence of the heat capacities of the Substances for the given reaction (SEE IMAGE)
(A). Write the overall equation for the heat capacity (in terms of the temperature, T) for the overall reaction.
(B). What would be change in enthalpy (∆H in KiloJoules) as the reaction transitions from 298K to a different temperature, such as 1,000K (from 298K to 1000K)?
(C). What would be the overall enthalpy change at 1,000 Kelvin (∆H @ 1000K, in KJ)?
(D). What would be the overall change in the internal energy at 1,000 Kelvin (∆U @ 1000K, in KJ)?
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