Use the following data (in kJ/mol) to estimate AH for the reac- tion S-(g) + e-→ S²-(g). Include an estimate of uncertainty. AHub Energy Energy of M of M Lattice lonization AHi Na,s -365 - 2203 495 109 -381 - 2052 419 90 Rb,s -361 - 1949 409 82 Cs,S - 360 - 1850 382 78 S(s) · S(g) AH = 277 kJ/mol S(g) + e → S (g) AH = -200 kJ/mol Assume that all values are known to ±1 kJ/mol.
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.
Use the following data (in kJ/mol) to estimate DH for the reaction
S2(g) 1 e2 n S22(g). Include an estimate of uncertainty.
Assume that all values are known to 61 kJ/mol.
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