Nitric acid and plumbous carbonate react: a) Write a balanced equation for this reaction. b) Calculate the enthalpy of the reaction. Show the enthalpy in the balanced equation (thermochemical equation). c) Calculate the enthalpy change of the reaction when 252 grams of nitric acid react with plumbous carbonate. NOTE: The enthalpies of formation for: Nitric Acid: -207 kJ/mole Plumbous Carbonate: -699 kJ/mole The Salt Formed: -421 kJ/mole.
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.
Nitric acid and plumbous carbonate react:
a) Write a balanced equation for this reaction.
b) Calculate the enthalpy of the reaction. Show the enthalpy in the balanced equation (thermochemical equation).
c) Calculate the enthalpy change of the reaction when 252 grams of nitric acid react with plumbous carbonate.
NOTE: The enthalpies of formation for:
Nitric Acid: -207 kJ/mole
Plumbous Carbonate: -699 kJ/mole
The Salt Formed: -421 kJ/mole.
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