Which of the reactions are exothermic? Check all exothermic reactions. :O: H3C CH3 AH = 75 kJ/mol CH₂(g) +20₂(g) → CO₂(g) + 2H₂O(1) - - H₂C=CHCH₂CH=CH₂ - CH₂(CH₂), CH₂ CH,CH,CH,CH, H₂C=CHCH₂CH3 + H₂ :0: :0: H₂N CH3 AH = -191 kJ/mol H3C ->> :OH ÖH CH₂ H₂N :0: он :Ō: AH-891 kJ/mol HÖ AH 254 kJ/mol = AH = -127 kJ/mol :0: CH3
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.
The chemical reaction that has negative enthalpy change(∆H) value is known as exothermic reaction.
So, the exothermic reactions among the given reactions are -
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