2. Acetylene is commonly used in welding torches and is known for burning very hot. Given the heats of formation in the table below, calculate the heat of combustion of acetylene in excess oxygen. Substance C₂H2 H₂O CO₂ Standard Heat of Formation +226.7 kJ/mol -285.8 kJ/mol -393.509 a. Find the heat of combustion of one mole of acetylene in oxygen: C₂H₂ + 5/2 0₂ ----> 2CO₂ + H₂O b. An acetylene tank, like many others of gas we use in the lab, is often pressurized. If a 4L tank containing pure acetylene at 298 K is pressurized to 10 atm, how much heat will be released if a welder burns all of it on a single job?
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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