Remaining Time: 2 hours, 09 * Question Completion Status: iii. How many O=O bonds are broken? iv. How many C=O bonds are are formed? v. How many O-H bonds are are formed? vi. Calculate the bond energy of C-C if the heat of combustion, AH for propane, C3Hg is -2050 kJ. Use the following bond dissociation enthalpies, D and the correct expression from the formula sheet and solve for C-C to get the answer. Bond |D (kJ/mol)
Remaining Time: 2 hours, 09 * Question Completion Status: iii. How many O=O bonds are broken? iv. How many C=O bonds are are formed? v. How many O-H bonds are are formed? vi. Calculate the bond energy of C-C if the heat of combustion, AH for propane, C3Hg is -2050 kJ. Use the following bond dissociation enthalpies, D and the correct expression from the formula sheet and solve for C-C to get the answer. Bond |D (kJ/mol)
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Chapter12: Kinetics
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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:Remaining Time: 2 hours, 09 minutes, 38 seconds.
* Question Completion Status:
iii. How many O=O bonds are broken?
iv. How many C=O bonds are are formed?
v. How many O-H bonds are are formed?
vi. Calculate the bond energy of C-C if the heat of combustion, AH for propane, C3Hg is -2050 kJ. Use the following bond dissociation enthalpies, D and the correct expression
from the formula sheet and solve for C-C to get the answer.
Bond D (kJ/mol)
C-H
413
O-0
495
C-O
799
O-H
463
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Transcribed Image Text:Remaining Time: 2 hours, 09 minutes, 49 seconds.
Question Completion Status:
Balanced reaction for the combustion of propane is given below. Actual structures of the reactants and the products without the lone-pair (non-bonding) electrons are shown
in the reaction.
H H H
+ 4
H.
H-C-C-C-
5 0=0
3 0=C=DO
H.
H HH
i. How many C-C bonds are broken in the above reaction?
ii. How many C-H bonds are broken?
iii. How many O=O bonds are broken?
iv. How many C=O bonds are are formed?
v. How many O-H bonds are are formed?
vi. Calculate the bond energy of C-C if the heat of combustion, AH for propane, C3H8 is -2050 kJ. Use the following bond dissociation enthalpies, D and the correct expression
from the formula sheet and solve for C-C to get the answer.
DELL
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