An English chemistry professor needs a cup of hot tea before grading 50 homework assignments but his electric water heater is broken . In his lab, however, he does have some ethanol (CH3CH2OH, MW=46.07gmol-1 ) and 1 gram of benzoic acid (C6H5COOH, MW=122.12 gmol-1 ). He knows that the benzoic acid has an enthalpy of combustion, H, of -3226.7 kJmol-1 . In a constant volume (bomb) calorimeter initially at 293.15 K, he finds that the combustion of 1.000 g of benzoic acid increased the temperature to 297.67 K. In the exact same calorimeter, 1.000 g of ethanol raised the temperature from 293.15K to 298.38K. (a) What is the enthalpy of combustion for 1 mole of ethanol?
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.
An English chemistry professor needs a cup of hot tea before grading 50 homework
assignments but his electric water heater is broken . In his lab, however, he does
have some ethanol (CH3CH2OH, MW=46.07gmol-1
) and 1 gram of benzoic acid
(C6H5COOH, MW=122.12 gmol-1
). He knows that the benzoic acid has an enthalpy
of combustion, H, of -3226.7 kJmol-1
. In a constant volume (bomb) calorimeter
initially at 293.15 K, he finds that the combustion of 1.000 g of benzoic acid
increased the temperature to 297.67 K. In the exact same calorimeter, 1.000 g of
ethanol raised the temperature from 293.15K to 298.38K.
(a) What is the enthalpy of combustion for 1 mole of ethanol?
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