Propane is a common fuel used in portable stoves. If a gas canister contains 0.283 dm3 of propane, what is the maximum heat it can produce? (The density of propane is 0.493 g/mL.) The combustion of propane is given by the equation: C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H20 (g) AH = -2221 kJ/mol
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.
Given,
C3H8 (g) + 5 O2 (g) ➝ 3 CO2 (g) + 4 H2O (g) ∆H = -2221KJ/mol
Here, (-) sign indicate the release of energy as heat in the reaction (exothermic reaction).
Volume of propane = 0.283 dm3 = 0.283 L = 0.283 × 1000 mL = 283 mL
Density of propane = 0.493 g/mL
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