A piece of unknown substance weighs 44.7 g and requires 2110 J to increase its temperature from 23.2 °C to 89.6 °C. If it is one of the substances found in following table, what is its likely identity? Specific Heats of Common Substances at 25 °C and 1 bar Substance Symbol (state) Specific Heat (Jig °C) Не (9) H20() helium 5.193 water 4.184 2.376 2.093 (at -10 °C) ethanol ice H20(s) water vapor 1.864 (6)0H 1.040 nitrogen N2(g) air 1.007 O9) Al(s) CO2(9) охудen 0.918 aluminum 0.897 carbon dioxide 0.853 Ar(g) Fe(s) Cu(s) argon 0.522 iron 0.449 copper 0.385 lead Pb(s) 0.130 gold Au(s) 0.129 silicon Si(s) 0.712 O Ar(g) Si(s)
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.
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