Exercised a) Calculate the heat. of Solid oxalic acid C₂H₂017 (5) Combustion AHP, 298k of at 25°C and atmospheric pressure, using standard mular enthalpies of formation. JOAN khowing That : SH₂, 1298 C₂ H₂ D sity, 29% CO₂(g) = Diff, 294 1₂0 (₁) 5) Calculate the standard enthalpy iron (111) oxide by reduction of aluminum 25°C. 2AL0 + F²203 (3) → 2 Fees) + A²₂03 (3) Knowing that: of (5) = -18 22.24 Jmai". -393 kJ moll -245, 2 KJ mol" at Atty, 298 Fe203 (s) = -196.5 Real mol-' Altgo, 298 Al2 O3657 = -399.1 x calmar"!
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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