2. Propane is the fuel used in outdoor gas grills. The thermochemical eqn for the combustion of propane is C3H8 (g) + 5 O2(g) → 3 CO2(g) + 4 H2O() AH = - 2044 kJ a) If 1530 kJ of heat must be produced by this reaction in order to cook a piece of meat on a grill, what mass of O2 (in grams) must react, assuming all the heat is absorbed by the meat? b) Calculate the mass of CO2 emitted into the atmosphere during the grilling of the meat. c) Use the AH of the reaction to determine the heat of combustion per gram of propane.
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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