U E Phosphoryl chloride, POC 3(g), is used in the manufacturing of flame retardants. It is manufactured in an equilibrium process in which phosphorus trichloride reacts with nitrogen dioxide to form POCl (g)and NO(g) according to the following equation: PC13 (g) + NO₂ (g) = POCI 3 (g) + NO (g) The Keq for this reaction at 800 K, is 3.88. If 1.35 mol PCI; (g) and 1.74 mol NO₂ (g) are placed into a 2.5 L container, how many moles will there be of each gas when the reaction reaches equilibriun PCI 3 (g) + NO₂ (g) = POCI3 (g) + NO(g) Kc = 3.88
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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