MISSED THIS? Watch KCV: The Change in Enthalpy for a Chemical Reaction, IWE: Stoichiometry Involving AH; Read Section 9.6. You can click on the Review link to access the section in your e Text. The propane fuel (C3H8) used in gas barbecues burns according to a thermochemical equation: Part A If a pork roast must absorb 1.7 x 10³ kJ to fully cook, and if only 10% of the heat produced by the barbeque is actually absorbed by the roast, what mass of CO₂ is emitted into the atmosphere during the grilling of the pork roast? Express your answer in grams to two significant figures. 197| ΑΣΦΑΛΟ 1012 C3H8(g) +502(g) →3CO₂ (g) +4H₂O(g), AHᵒrn =-2044 kJ ? g

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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.