1) For each compound, complete the following steps: a) Write a complete, balanced combustion equation using Lewis structures for all species. An example for methane is shown below. b) Make a list of all the bonds that are broken and formed during the reaction (see also example below). c) Calculate AH in kJ/mol using the equation above. d) Calculate the AH in kJ/g. Ex. Balanced Combustion Equation for Methane (CH4) H H-C-H I H +20=0 Bond Broken (energy absorbed) 4 C-H bonds 2 0-0 bonds 0=c=0 + 2 H-0-H Bonds Formed (energy released) 2 C=O bonds 4 0-H bonds
1) For each compound, complete the following steps: a) Write a complete, balanced combustion equation using Lewis structures for all species. An example for methane is shown below. b) Make a list of all the bonds that are broken and formed during the reaction (see also example below). c) Calculate AH in kJ/mol using the equation above. d) Calculate the AH in kJ/g. Ex. Balanced Combustion Equation for Methane (CH4) H H-C-H I H +20=0 Bond Broken (energy absorbed) 4 C-H bonds 2 0-0 bonds 0=c=0 + 2 H-0-H Bonds Formed (energy released) 2 C=O bonds 4 0-H bonds
Chemistry
10th Edition
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.
Question
Do propane (CH8)
question 1) C and D
Transcribed Image Text:Knowing this, the change in enthalpy (AH) for a reaction- the amount of heat energy absorbed
or released- can be estimated using the following equation and the BDE's of various chemical
bonds:
Bond
H-H
H-C
H-O
H-F
H-CI
H-Br
Br-Br
AH (BDE's of bonds breaking) - (BDE's of bonds being formed)
BDE (kJ/mol)
432
411
459
565
428
362
190
Literature Combustion Data:
Methane Data Page
● Ethane Data Page
Propane Data Page
Ethanol Data Page
Bond
C-C
C=C
CEC
C-O
C=O
H-1
|-
BDE (kJ/mol)
346
602
835
358
799
295
148
Bond
N-N
N=N
NEN
O-O
0=0
F-F
CI-CI
BDE (kJ/mol)
167
418
942
142
494
155
240
For this demonstration to the CEO, we're going to calculate the change in enthalpy, AH, for the
combustion of 4 compounds: methane (CH4), ethane (C₂H6), propane (C3H8), and ethanol
(C₂H5OH).
Transcribed Image Text:1)
For each compound, complete the following steps:
a) Write a complete, balanced combustion equation using Lewis structures for all
species. An example for methane is shown below.
b) Make a list of all the bonds that are broken and formed during the reaction (see
also example below).
c) Calculate AH in kJ/mol using the equation above.
d) Calculate the AH in kJ/g.
Ex. Balanced Combustion Equation for Methane (CH4)
H
H-C-H + 20=0
H
Bond Broken (energy absorbed)
4 C-H bonds
2 0=0 bonds
0=c=0 +
2 H-O-H
Bonds Formed (energy released)
2 C=0 bonds
4 O-H bonds
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