Without referring to tables, predict which of the followinghas the higher enthalpy in each case: (a) 1 mol CO2(s) or1 mol CO2(g) at the same temperature, (b) 2 mol of hydrogenatoms or 1 mol of H2, (c) 1 mol H2(g) and 0.5 mol O2(g) at25 °C or 1 mol H2O(g) at 25 °C, (d) 1 mol N2(g) at 100 °C or1 mol N2(g) at 300 °C.
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.
Without referring to tables, predict which of the following
has the higher enthalpy in each case: (a) 1 mol CO2(s) or
1 mol CO2(g) at the same temperature, (b) 2 mol of hydrogen
atoms or 1 mol of H2, (c) 1 mol H2(g) and 0.5 mol O2(g) at
25 °C or 1 mol H2O(g) at 25 °C, (d) 1 mol N2(g) at 100 °C or
1 mol N2(g) at 300 °C.
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