Part B The combustion of toluene has a Arxn of - 3.91 × 10³ kJ/mol. When 1.55 g of toluene (C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.12 °C to 37.57 ˚C. Find the heat capacity of the bomb calorimeter. Express the heat capacity in kilojoules per degree Celsius to three significant figures. Ccal = Submit VE ΑΣΦ - 271 Previous Answers Request Answer ? kJ/°C X Incorrect; Try Again; 5 attempts remaining You may have divided AErxn by the temperature change. However, qcal = Ccal × ΔΤ, so you must first calculate qcal based on the number of moles of toluene and then divide that by the temperature change to determine the heat capacity of the bomb calorimeter. Additionally, note that arxn=-qcal because the heat released by the reaction is absorbed by the calorimeter, so make certain you report your answer with the correct sign.
Part B The combustion of toluene has a Arxn of - 3.91 × 10³ kJ/mol. When 1.55 g of toluene (C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.12 °C to 37.57 ˚C. Find the heat capacity of the bomb calorimeter. Express the heat capacity in kilojoules per degree Celsius to three significant figures. Ccal = Submit VE ΑΣΦ - 271 Previous Answers Request Answer ? kJ/°C X Incorrect; Try Again; 5 attempts remaining You may have divided AErxn by the temperature change. However, qcal = Ccal × ΔΤ, so you must first calculate qcal based on the number of moles of toluene and then divide that by the temperature change to determine the heat capacity of the bomb calorimeter. Additionally, note that arxn=-qcal because the heat released by the reaction is absorbed by the calorimeter, so make certain you report your answer with the correct sign.
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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Transcribed Image Text:Part B
The combustion of toluene has a Arxn of - 3.91 × 10³ kJ/mol. When 1.55 g of toluene
(C7H8) undergoes combustion in a bomb calorimeter, the temperature rises from 23.12 °C to
37.57 ˚C. Find the heat capacity of the bomb calorimeter.
Express the heat capacity in kilojoules per degree Celsius to three significant figures.
Ccal
=
Submit
VE ΑΣΦ
- 271
2
Previous Answers Request Answer
?
kJ/°C
X Incorrect; Try Again; 5 attempts remaining
You may have divided AErxn by the temperature change. However, qcal Ccal X AT,
so you must first calculate qcal based on the number of moles of toluene and then divide
that by the temperature change to determine the heat capacity of the bomb calorimeter.
Additionally, note that arxn = −qcal because the heat released by the reaction is
absorbed by the calorimeter, so make certain you report your answer with the correct
sign.
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