2.48 The molar heat capacity of for temperatures in the range 300 to erate pressures can be approximate a = 6.15 cal mol- K-l and b = (a) Calculate q, w, AU, and AH v versibly heated from 27°C to 12 1.00 atm. Assume perfect-gas behav and AH when 2.00 mol of O, initia. heated from 27°C to 127°C with V
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.
![2.48 The molar heat capacity of oxygen at constant pressure
for temperatures in the range 300 to 400 K and for low or mod-
erate pressures can be approximated as Cpm
a = 6.15 cal mol- K- and b
(a) Calculate q, w, AU, and AH when 2.00 mol of 0, is re-
versibly heated from 27°C to 127°C with P held fixed at
1.00 atm. Assume perfect-gas behavior. (b) Calculate q, w, AU,
and AH when 2.00 mol of O, initially at 1.00 atm is reversibly
heated from 27°C to 127°C with V held fixed.
= a + bT, where
0.00310 cal mol- K-2.
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