5.121 A gas company in Massachusetts charges 27 cents for amole of natural gas (CH4). Calculate the cost of heating200 mL of water (enough to make a cup of coffee ortea) from 20°C to 100°C. Assume that only 50 percentof the heat generated by the combustion is used to heatthe water; the rest of the heat is lost to the surroundings.
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.
5.121 A gas company in Massachusetts charges 27 cents for a
mole of natural gas (CH4). Calculate the cost of heating
200 mL of water (enough to make a cup of coffee or
tea) from 20°C to 100°C. Assume that only 50 percent
of the heat generated by the combustion is used to heat
the water; the rest of the heat is lost to the surroundings.
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