Propane is a gas commonly used to fuel gas grills and camping stoves. The structure of propane is shown below. Write the balanced chemical equation for the combustion of propane. Draw out lewis dot structures to represent all molecules of all products and reactants in this reaction. The number of each molecule should be reflected in the balanced equation. Calculate the heat of combustion for propane using the bond enthalpies in the table. 1.00 mol of propane is used to roast marshmallows. It was determined that the amount of energy absorbed by the marshmallows was only 800 kJ. Explain this observation.
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.
Propane is a gas commonly used to fuel gas grills and camping stoves. The structure of propane is shown below.
- Write the balanced chemical equation for the combustion of propane.
- Draw out lewis dot structures to represent all molecules of all products and reactants in this reaction. The number of each molecule should be reflected in the balanced equation.
- Calculate the heat of combustion for propane using the bond enthalpies in the table.
- 1.00 mol of propane is used to roast marshmallows. It was determined that the amount of energy absorbed by the marshmallows was only 800 kJ. Explain this observation.
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