Consider 25.6 g of sodium bicarbonate is reacted completely with 1.01 kg of vinegar. The starting temperature of the vinegar is 25.4 ºC . What would the final temperature of the reaction solution be in ºC after the reaction is complete? The specific heat capacity of the solution is 4.18 J g-1 K-1, the molar mass of sodium bicarbonate is 84.007 g/mol and the enthalpy of reaction is 53.4 kJ/mol. The vinegar is a 0.87 M solution of acetic acid in water.
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.
Consider 25.6 g of sodium bicarbonate is reacted completely with 1.01 kg of vinegar. The starting temperature of the vinegar is 25.4 ºC . What would the final temperature of the reaction solution be in ºC after the reaction is complete? The specific heat capacity of the solution is 4.18 J g-1 K-1, the molar mass of sodium bicarbonate is 84.007 g/mol and the enthalpy of reaction is 53.4 kJ/mol. The vinegar is a 0.87 M solution of acetic acid in water.
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