2. Solid nitrogen triiodide decomposes explosively to form gaseous nitrogen (N2) and iodine (I2). The enthalpy change of the reaction is -145 kJ per mole of NI3. a) Write the balanced thermochemical equation for this reaction, including the AH value. b) Calculate the grams of I2 formed if the reaction generates 915 kJ of heat. c) State whether each of the following statements is true or false and briefly explain your answers. i) Heat is absorbed by the surroundings. ii) The enthalpy of NI; is lower than the enthalpy of the N2 and I2. iii) Work is done by the system.
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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