C3H3 (g) + 5 02 (g) 3 CO2 (g) + 4 H20 (8) The standard enthalpies of formation of CO2 (g) and H20 (8) are - 4.00 x 102 kJ/mol and - 2.90 x 102 kJ/mol, respectively. When 11.2 L cO, (g) at STP is formed via the given reaction, 350 kJ of heat is released. Which of the following statements is/are false for this reaction? 1. The standard enthalpy of formation of C3H3 (g) is - 260 kJ/mol. II. 232 kJ of heat is released when 14.4 g H20 (8) is formed via the given equation. II. When this reaction is carried out at constant pressure and temperature, work is done by the reacting system on the surroundings.
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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