Sodium chloride, the table salt (NaCl) is added in cooking to enhance the flavor of the food. When 10.0 g of NaCl are added in 200.0 mL of water at 25.0OC in a coffee-cup calorimeter, 669 J of heat are absorbed. (Assume that there is no change in volume, d=1.00 g/mL,, specific heat=4.18 J/g.OC) a) Is the solution process exothermic? b) What is qH2O ? c) What is the final temperature of the solution?
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.
Sodium chloride, the table salt (NaCl) is added in
cooking to enhance the flavor of the food. When
10.0 g of NaCl are added in 200.0 mL of water at
25.0OC in a coffee-cup calorimeter, 669 J of heat
are absorbed. (Assume that there is no change in
volume, d=1.00 g/mL,, specific heat=4.18 J/g.OC)
a) Is the solution process exothermic?
b) What is qH2O ?
c) What is the final temperature of the solution?
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