A B C D a. Calculate the temperature energy difference, energy transferred and energy each fuel transferred per gram. Temperature Temperature before in °C Temperature Difference in °C Energy transferred in Mass of fuel used in g Energy per gram in J/g after in °C J 56 3.2 64 4.3 52 3.6 61 3.9 Fuel 2722 20 21 19 433 4,725 4,200 5,238 4,415
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.
Complete the table.
![D. ENERGY TRANSFER. The energy releases are a measured in Joule (J) or kilojoules (kJ). To find this value we
need to know how much energy was transferred to the water. This depends on two thigs: the mass of water
heated and its temperature rise. Each cm³ of water has a mass of 1 g and each gram of water takes 4.2 J to
make it 1 °C hotter. So, the energy transferred to the water can be calculated using this equation.
Energy transferred (J) = mass of water heated (g) * 4.2 * temperature change in °C
The result in the table below were obtained when four different fuels were used to heat 100 cm3 of water.
Calculate the amount of energy each fuel transferred.
To compare fuels fairly we need to know how much energy they release per gram.
This can be found by dividing the total energy transferred by the grams of fuel used.
Energy per gram = energy supplied (J)
Mass of fuel burnt (g)
a.
Calculate the temperature energy difference, energy transferred and energy each fuel transferred per
gram.
Temperature
before in °C
Temperature
after in °C
Temperature
Difference in
°℃
Energy
transferred in
J
Mass of fuel
used in g
Fuel
Energy per
gram in J/g
56
3.2
64
4.3
52
3.6
61
3.9
ABCD
2722
20
21
19
4,725
4,200
5,238
4,415](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F27e57de7-163c-4c73-9817-9017026724fe%2F125515e0-bfd9-4461-ab58-145c5e12c986%2F0tvav37_processed.jpeg&w=3840&q=75)
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