The specific heat of octane, C8H18(l), is 2.22 J/g-K. (a) Howmany J of heat are needed to raise the temperature of 80.0 gof octane from 10.0 to 25.0 °C? (b) Which will require moreheat, increasing the temperature of 1 mol of C8H18(l) bya certain amount or increasing the temperature of 1 mol ofH2O(l) by the same amount?
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.
The specific heat of octane, C8H18(l), is 2.22 J/g-K. (a) How
many J of heat are needed to raise the temperature of 80.0 g
of octane from 10.0 to 25.0 °C? (b) Which will require more
heat, increasing the temperature of 1 mol of C8H18(l) by
a certain amount or increasing the temperature of 1 mol of
H2O(l) by the same amount?
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