6. Enthalpies of Formation: A common experiment in industrial chemistry application is when Ethanol (C2H5OH) is blended with gasoline as an automobile fuel. (a) As a GCHEM203A student you must confidently write a balanced equation for the combustion of liquid ethanol in air [Recall the basics of combustion reactions]. (b) Calculate the standard enthalpy change for the reaction, assuming H2O (g) as a product. (c) Calculate the heat produced per liter of ethanol by combustion of ethanol under constant pressure. Ethanol has a density of 0.789 g/mL. (d) Calculate the mass of CO2 produced per kJ of heat emitted.
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.
![6. Enthalpies of Formation: A common experiment in industrial chemistry application is when Ethanol
(C2H5OH) is blended with gasoline as an automobile fuel. (a) As a GCHEM203A student you must
confidently write a balanced equation for the combustion of liquid ethanol in air [Recall the basics of
combustion reactions]. (b) Calculate the standard enthalpy change for the reaction, assuming H2O (g) as
a product. (c) Calculate the heat produced per liter of ethanol by combustion of ethanol under constant
pressure. Ethanol has a density of 0.789 g/mL. (d) Calculate the mass of CO2 produced per kJ of heat
emitted.
7. Food and Fuels: You have decided to take culinary, or food science related course in college. (a) You
plan to estimate the number of calories in the dedicated serving of chicken noodle soup that contains 2.5
g fat, 14 g carbohydrate, and 7 g protein. (b) According to its nutrition estimate of your nutritionist, the
same soup also contains 690 mg of sodium. Do you think the sodium contributes to the caloric c
the soup?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F293763f1-1e41-4682-95d4-b4f959da68e7%2F959b32fe-9761-41b2-bcb2-ac9fef70d653%2Fl58xczq_processed.jpeg&w=3840&q=75)
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