When 10.0 g of C5H12 is burned (combustion with excess oxygen gas) 453 kJ of energy is released. а. Write the balanced chemical equation for this reaction. b. Is this reaction exothermic or endothermic? What is the sign of ΔΗ? AH values are normally written in units of kJ/mol. What is AH for this reaction in units of kJ/mole C5H12? (-3270 kJ/mol) с. d. Write the balanced thermochemical equation for the combustion of C5H12. Is energy a reactant or product?
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.
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