On a 12 day wilderness expedition you'll need to heat 4.0kg of water to the boiling point each day. The air temperature will average 25°C . You have available canisters of compressed propane C3H8 fuel, which you'll burn to heat the water. Each canister has 25.g of propane in it. What is the minimum number of fuel canisters you must bring? The standard heat of formation of propane at 25°C is −103.8kJ/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.
On a
day wilderness expedition you'll need to heat
of water to the boiling point each day. The air temperature will average
. You have available canisters of compressed propane
fuel, which you'll burn to heat the water. Each canister has
of propane in it. What is the minimum number of fuel canisters you must bring?
The standard heat of formation of propane at
is
.
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