12. Commercial hydrochloric acid and sodium sulfate are produced by the reaction: NaCl + H2O + SO3 = Na2SO4 + HCI The reaction is carried at 482°C. After separation of the NażSO4, the HCI is to be absorbed in water. Per 1000 kg of sodium chloride charged, how much Na2SO4 and 87% by wt aqueous hydrochloric acid solution are obtained if the reaction goes to 90% completion? If the SO3 is supplied 20% in excess and H2O, 100 % in excess of the theoretical amount, how much 98% sulfuric (SO3and H2O) and fresh water should be fed to the reactor?
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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