Two solutions, 100.0 mL of 1.00 M AgNO3 (aq) and 100.0 mL of 1.00 M NaCl (aq), both initially at 22.4oC, are added to a Styrofoam-cup calorimeter and allowed to react. After the reactants are mixed by stirring, the temperature is observed to increase to 30.2oC. The net ionic equation for this reaction is Ag+ (aq) + Cl-(aq) → AgCl (s) a) Determine qrxn per mole of AgCl (s) in the reaction. b) Is the reaction endothermic or exothermic?
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.
Two solutions, 100.0 mL of 1.00 M AgNO3 (aq) and 100.0 mL of 1.00 M NaCl (aq), both initially
at 22.4oC, are added to a Styrofoam-cup calorimeter and allowed to react. After the reactants
are mixed by stirring, the temperature is observed to increase to 30.2oC. The net ionic equation
for this reaction is
Ag+ (aq) + Cl-(aq) → AgCl (s)
a) Determine qrxn per mole of AgCl (s) in the reaction.
b) Is the reaction endothermic or exothermic?
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