Q3.) Acetylene gas, C2H2(g), is used in welding. 1. Write a balanced equation for the combustion of acetylene gas to CO2(g) and H2O(l). (Express your answer as a chemical equation. Identify all of the phases in your answer.) 2. How much heat is produced in burning 5 mol of C2H2 under standard conditions if both reactants and products are brought to 298 K? (Express your answer using five significant figures.) 3. What is the maximum amount of useful work that can be accomplished under standard conditions by this reaction when 5 mol of C2H2 is burned? (Express your answer using five significant figures.)
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.
Q3.) Acetylene gas, C2H2(g), is used in welding.
1. Write a balanced equation for the combustion of acetylene gas to CO2(g) and H2O(l). (Express your answer as a chemical equation. Identify all of the phases in your answer.)
2. How much heat is produced in burning 5 mol of C2H2 under standard conditions if both reactants and products are brought to 298 K? (Express your answer using five significant figures.)
3. What is the maximum amount of useful work that can be accomplished under standard conditions by this reaction when 5 mol of C2H2 is burned? (Express your answer using five significant figures.)
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