Take the real AH values for the four compounds from the linked data sources and divide each by the number of moles of O₂ that react per mole of fuel. (For example, 3.5 0₂'s react with 1 ethane.) This will give you a AH per mole of oxygen for the reaction. What does this result say about the amount of energy that can be released from combustion reactions?
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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3.4 Assignment - X
Contents [hide]
(Top)
Material Safety Data Sheet
Structure and properties
Cited sources
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Thermodynamic properties
Vapor pressure of liquid
Spectral data
References
8
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e of liquid
Contents [hide]
(Top)
Material Safety Data Sheet
Structure and properties
Thermodynamic properties
Vapor pressure of liquid
Melting point data
Spectral data
References
y Data Sheet
9:07 AM Fri Aug 18
W Methane (data pag X
ata Sheet
eous
perties
properties
aqueous
en.wikipedia.org/wiki/Methane_(data_page)
liquid
- at various
Si
Std enthalpy change
of formation, AH liquid
Standard molar entropy,
Se
liquid
gas
Heat capacity, Cp
Std
change
of formation, AH gas
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van der Waals' constants[10]
T
(°C)
Se
solid
Standard molar entropy,
Se
gas
Enthalpy of combustion AH-891 kJ/mol[⁹]
Heat capacity, Cp
35.7 J/(mol K)[8]
a = 228.29 L² kPa/mol²
b= 0.04278 L/mol
solid
Vapor pressure of liquid [edit]
P
(mm 1
Hg)
3.4 Assignment - X W Propane (data pag X
Heat capacity, Cp
Std enthalpy change
of formation, AH liquid
10
gas
Standard molar entropy,
Sº
liquid
Heat capacity, Cp
Std enthalpy change
of formation, AH
Standard molar entropy,
So
liquid
Heat capacity, Cp
gas
3.4 Assignment - X W Ethanol (data page X
? J/(mol K)
Gas properties
van der Waals' constants[¹]
en.wikipedia.org/wiki/Propane_(data_page)
10
-205.9 -195.5 -187.7 -181.4 -168.8 -161.5 -152.3 -138.3 -124.8 -108.5 -86.3
Std enthalpy change
of formation, AH gas
Standard molar entropy,
Se
Heat capacity, Cp
? kJ/mol
Liquid properties
? J/(mol K)
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van der Waals' constants[²]
-74.6 kJ/mol[8]
40
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186.3 J/(mol K)[8]
en.wikipedia.org/wiki/Ethanol_(data_page)
40
Std enthalpy change
of formation, AH liquid
Enthalpy of combustion, AH -1560.7 kJ/mol
Heat capacity, Cp
Gas properties
Vapor pressure of liquid [edit]
Pin
mm 1
Hg
...
Std enthalpy change
of formation, AH gas
Standard molar entropy
100
UTIV
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? J/(mol K)
? kJ/mol
126.7 J/(mol K)
68.5 J/(mol K) at -179 °C
-83.8 kJ/mol
229.6 J/(mol K)
52.49 J/(mol K) at 25 °C
a = 556.2 L² kPa/mol²
b= 0.06380 L/mol
100
....
400
Gas properties
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98.36 J/(mol K)
400 760
-104.7 kJ/mol
Enthalpy of combustion, AH -2220.0 kJ/mol
Heat capacity, Cp
73.60 J/(mol K)
a = 877.88 L² kPa/mol²
b = 0.08445 liter per mole
....
269.91 J/(mol K)
760
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Liquid properties
-277.38 kJ/mol
Standard molar entropy,
So liquid
Enthalpy of combustion, AH-1370.7 kJ/mol
112.4 J/(mol K)
Heat capacity, Cp
Gas properties
111.46 J/(mol K) [5]
159.9 J/(mol K)
006
-235.3 kJ/mol
1
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1520 3800
LIZ
1520
3800 7600
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Density of liquid and gas [edit]
Propane is highly temperature dependent. The density of liquid and gaseous propane are g
imago
7600
B
@
@ 81%
15200 30400 45600
81%
15200 30400 45600
(a
@ 81%
G Compare your calc X +
III
@81%
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=
6
III
=
þ
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