You are camping and need to cook all your food using your camp stove which runs off of propane. If you wanted to warm up your giant mug (67.628 fluid ounces) of morning coffee from 10°C to 80°C, what mass of propane would you have to use? The ΔHcomb for propane is -2219.2 kJ/mol, the density of coffee is 1.0002 g/mL, and the specific heat capacity of coffee is equal to that of water. (Use the GRASP Method) 1 fluid ounce = 0.0295735 L
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.
You are camping and need to cook all your food using your camp stove which runs off of propane.
If you wanted to warm up your giant mug (67.628 fluid ounces) of morning coffee from 10°C to 80°C,
what mass of propane would you have to use?
The ΔHcomb for propane is -2219.2 kJ/mol, the density of coffee is 1.0002 g/mL, and the specific heat
capacity of coffee is equal to that of water. (Use the GRASP Method)
1 fluid ounce = 0.0295735 L
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