9.103 One reason why the energy density of a fuel is important is that to move a vehicle one must also move its unburned fuel. Octane is a major component of gasoline. It burns according to the reaction 2C 8 H 18 ( l ) + 25 O 2 ( g ) → 16CO 2 ( g ) + 18H 2 O ( g ) Δ H ° = − 1 . 1 0 × 1 0 4 kJ Starting from this thermochemical equation, describe how you would determine the energy density, in kJ/g, for octane. Be sure to indicate what you would need to calculate or look up to complete this problem.
9.103 One reason why the energy density of a fuel is important is that to move a vehicle one must also move its unburned fuel. Octane is a major component of gasoline. It burns according to the reaction 2C 8 H 18 ( l ) + 25 O 2 ( g ) → 16CO 2 ( g ) + 18H 2 O ( g ) Δ H ° = − 1 . 1 0 × 1 0 4 kJ Starting from this thermochemical equation, describe how you would determine the energy density, in kJ/g, for octane. Be sure to indicate what you would need to calculate or look up to complete this problem.
Solution Summary: The author explains that the energy density of octane should be calculated based on its enthalpy of combustion data. Combustion is an exothermic process.
9.103 One reason why the energy density of a fuel is important is that to move a vehicle one must also move its unburned fuel. Octane is a major component of gasoline. It burns according to the reaction
2C
8
H
18
(
l
)
+
25
O
2
(
g
)
→
16CO
2
(
g
)
+
18H
2
O
(
g
)
Δ
H
°
=
−
1
.
1
0
×
1
0
4
kJ
Starting from this thermochemical equation, describe how you would determine the energy density, in kJ/g, for octane. Be sure to indicate what you would need to calculate or look up to complete this problem.
Given: N2(g) + 3H2(g)2NH3(g)
AG° = 53.8 kJ at 700K. Calculate AG for the above reaction at 700K if the reaction mixture consists of 20.0 atm of N2(g),
30.0 atm of H2(g), and 0.500 atm of NH3(g).
A) -26.9 kJ
B) 31.1 kJ
C) -15.6 kJ
D) 26.9 kJ
E) -25.5 kJ
Explain the structure of the phosphomolybdate anion [PMo12O40]3-.
g.
NaI, H3PO4
h.
1. BH3/THF
2. H₂O2, OH
i.
HC1
j.
Br
Chapter 9 Solutions
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