a. The methanol in an automobile engine must be in the gas phase before it can react. Calculate the heat (in kJ) that must be added to 1.00 kg of liquid methanol in order to increase its temperature from 25.0°C to its normal boiling point of 65.0°C. The molar heat capacity of liquid methanol is 81.6 J/K*mol. b. Once the methanol has reached its boiling point, it must be vaporized. The molar enthalpy of vaporization, AHvap, for methanol is 38 kJ/mol. How much heat must be added to vaporize 1.00 kg of methanol?
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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