Question 2 The molar heat capacity of a sample of gas at constant-pressure varies with temperature according to the following equation, Cp.m (J. K¯¹) = a + bT+¶µ²- Calculate the change in enthalpy of NO(g) when the temperature is raised from 25°C to 350°C. Question 3 CO2(g) is heated from 25°C to 500°C. Calculate the molar enthalpy of formation for CO2(g), as a real gas, for this heating process. Question 4 The density of CO2 is experimentally determined as being 44.0 g.L-1 at 5 atm and 27 °C. (i) Calculate the value of the molar volume, Vm. (ii) Calculate the value of the compression factor, Z, at 27 °C. (iii) What can you deduct from the value of Z?
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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