Under constant-volume conditions, the heat of combustion ofbenzoic acid 1C6H5COOH2 is 26.38 kJ>g. A 2.760-g sample ofbenzoic acid is burned in a bomb calorimeter. The temperatureof the calorimeter increases from 21.60 to 29.93 °C. (a) What isthe total heat capacity of the calorimeter? (b) A 1.440-g sampleof a new organic substance is combusted in the same calorimeter.The temperature of the calorimeter increases from 22.14 to27.09 °C. What is the heat of combustion per gram of the newsubstance? (c) Suppose that in changing samples, a portionof the water in the calorimeter were lost. In what way, if any,would this change the heat capacity of the calorimeter?
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.
Under constant-volume conditions, the heat of combustion of
benzoic acid 1C6H5COOH2 is 26.38 kJ>g. A 2.760-g sample of
benzoic acid is burned in a bomb calorimeter. The temperature
of the calorimeter increases from 21.60 to 29.93 °C. (a) What is
the total heat capacity of the calorimeter? (b) A 1.440-g sample
of a new organic substance is combusted in the same calorimeter.
The temperature of the calorimeter increases from 22.14 to
27.09 °C. What is the heat of combustion per gram of the new
substance? (c) Suppose that in changing samples, a portion
of the water in the calorimeter were lost. In what way, if any,
would this change the heat capacity of the calorimeter?
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