What is the ∆Horxn for formation of 31.2 g of KCl in the reaction shown below? 2 KClO3 (s) → 2 KCl (s) + 3O2 (g) ∆H = -89.4 kJ ________________ 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.
1). What is the ∆Horxn for formation of 31.2 g of KCl in the reaction shown below?
2 KClO3 (s) → 2 KCl (s) + 3O2 (g) ∆H = -89.4 kJ
________________ kJ
2).A 360. mL sample of water was cooled from 70.0oC to 10.0oC. How much heat was lost?
Assume density of water 1.00g/mL. (The specific heat of water is 4.184 J/goC).
________________ kJ
3).A piece of metal weighing 5.10 g at temperature of 48.6oC was placed in calorimeter in 20.00
mL of water at 22.1oC. The final equilibrium temperature was found to be 29.2oC. What is the
specific heat of the metal? (The specific heat of water is 4.184 J/goC ; density of water 1.00g/mL).
_______________ J/g.0C
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