When a 0.740-g sample of trinitrotoluene (TNT), C,H,NO, is burned in a bomb calorimeter, the temperature increases from 23-4 °C to 26.9 °C. The heat capacity of the calorimeter is 534 J/°C, and it contains 675 mL of water. How much heat was produced by the combustion of the TNT sample? Give answer in kJ.
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.
![When a 0.740-g sample of trinitrotoluene (TNT), C,H,NO, is burned in a bomb calorimeter, the temperature increases
from 23-4 °C to 26.9 °C. The heat capacity of the calorimeter is 534 J/°C, and it contains 675 mL of water. How much
heat was produced by the combustion of the TNT sample? Give answer in kJ.
kJ
The addition of 3.15 g of Ba(OH), 8H,O to a solution of 1.52 g of NH SCN in 100 g of water in a calorimeter caused the
temperature to fall by 3.1 °C. Assuming the specific heat of the solution and products is 4.20 J/g °C, calculate the
approximate amount of heat absorbed by the reaction, which can be represented by the following equation:
Ba(OH), 8H₂O(s) + 2NH SCN(aq)-Ba(SCN),(aq) + 2NH, (aq) + 10H,O(1)
kJ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb7f76412-636c-440f-910b-2f8c9c9a9729%2F4cde8f14-2356-4c50-92da-ccc16b0ec3ca%2Fentroi2_processed.jpeg&w=3840&q=75)
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