Acetylene gas (HC≡CH) burns in an oxygen (O2) rich torch to produce carbon dioxide and water vapor. The enthalpy of reaction for the combustion of acetylene is 1259 kJ/mol. Please use this information to solve Parts A,B,C,D. A) Calculate the C≡C bond energy. C-H: 413 kJ/mol O-O: 498 kJ/mol C-O: 799 kJ/mol O-H: 467 kJ/mol B) When 500.0 g of acetylene burns, how many kilojoules of heat are given off? C) How many grams of CO2 form?
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.
Acetylene gas (HC≡CH) burns in an oxygen (O2) rich torch to produce carbon dioxide and water vapor. The enthalpy of reaction for the combustion of acetylene is 1259 kJ/mol. Please use this information to solve Parts A,B,C,D.
A) Calculate the C≡C bond energy.
C-H: 413 kJ/mol
O-O: 498 kJ/mol
C-O: 799 kJ/mol
O-H: 467 kJ/mol
B) When 500.0 g of acetylene burns, how many kilojoules of heat are given off?
C) How many grams of CO2 form?
D) How many liters of O2 at 298 K and 18.0 atm are consumed?
PV=nRT & R=0.0821 (L*atm)/(mol*K)
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