3.| N2(g) + 3CI2(g) → 2NCI3(1) AH°rxn = +460 kJ The reaction is _thermic, heat flows bonds between the atoms become er Calculate the following - with proper sign and number of significant figures! When the reaction heat is +902 kJ, moles of Cl2 have reacted. When 0.45 moles of NCI3 have formed, the reaction heat is kJ When 4.8x1022 N2 molecules have reacted, the reaction heat is kJ Now consider a reaction mixture of 6.5 LSTP of N2(g) and 16 LSTP of Cl2(g): .. If all 6.5 LSTP of N2(g) react, the reaction heat is kJ (sign and sig figs!) .. If all 16 LSTP of Cl2(g) react, the reaction heat is kJ . The limiting reagent in this mixture is ... ... The theoretical heat of this reaction mixture is kJ
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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