For the Theoretical Systems We could also calculate what values we SHOULD get from theoretical tables. The standard molar enthalpy of formation of CuSO4 is -771.4 kj/mol. The others can be found on the table T1, copied below for Cu, Fe, Mg, and Zn. A = Mg + ZnS04 reacted to give MgSO4 + Zn Reaction A = -1284.9 kJ/mol for MBSO4 formation (Zn is zero) + 982.8 kJ/mol for the destruction of ZnSO4 (Mg 0) Similarly Reaction B is Zn + CuSO4 gives Cu + ZnSO4 = - 982.8 kJ/mol for the formation of ZnS04 (Cu = 0) • 771.4 kJ/mol (for the destruction of CuS04) Overall for this reaction we should get a net heat RELEASE of -1284.9 + 771.4 = -513 kJ/mol This is because, as you can see, the ZnSO4 destroyed (reacted) in the first reaction is formed in the second, so these two will cancel out, therefore giving the same theoretical result as the reaction of Mg and CuSO4. TRUE or FALSE - the experimental values are the same as the theoretical ones. Select one: O True O False
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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